Skip to main content

Is Abortion Morally Right or Wrong? (A Philosophical Perspective)



One of the most debated questions today is whether or not abortion is morally acceptable, and, if it is, until what stage in the development of the substance which is created by the fertilization of a human egg by a human sperm?[1] This blog post is the second article in a series of blog articles that are being published by the Canadian Apologetics Coalition. Click here to see the first article in the series. Click here to see the full list of articles to come, with links being added as the articles are published.

The argument that I will be advancing is based upon arguments and definitions that I have advanced in a blog series that I did on What it means to be a Human Person, parts 1-13,[2] as such it is purely philosophical.[3] The following argument seems to demonstrate that abortion, from the moment of fertilization onward, is pre-meditated murder, where Pre-meditated murder is defined as planning to kill a human-being, and following through on the plan, thereby successfully killing the human being; or, in other words, successfully killing a human being in a way that was planned prior to the action. Furthermore, if the argument is valid, and sound, then it is a morally objective fact that abortion from fertilization onward is as morally depraved as premeditated murder, and this conclusion is based upon human nature. Aristotle defines humans as rational animals, seeing as I have defended this definition in the series mentioned above, I will presuppose it in this argument.

The Argument is as follows:

(1)   Any X is human if and only if X has a rational form.
(2)   X possesses a rational form if and only if X is either actually thinking rationally, or in potency to rational thought.
(3)   The substance created by human fertilization is in potency to rational thought.
(4)   Therefore, the substance created by human fertilization possesses a rational form.
(5)   Therefore, the substance created by human fertilization is human, by definition.
(6)   Pre-meditated murder is successfully killing a human being in a way that was planned prior to the action. (If X is killed according to a pre-established plan, and X is a human, then X is the victim of pre-meditated murder.)
(7)   The substance created by human fertilization is killed according to a pre-established plan when it is aborted.
(8)   Therefore, killing (aborting) the substance created by human fertilization is the moral equivalent of pre-meditated murder.

A consequence of this argument is that, if it is morally wrong to commit pre-meditated murder, then it is morally wrong to kill the substance created by human fertilization. Therefore, Abortion is pre-meditated murder.

For those who are interested I worked this argument out using predicate logic, and it seems to be valid.[4] (Perhaps a better logician than I would disagree. I would appreciate any comments on this point.) The soundness of this argument depends, of course, upon the truth of each of the premises.

Premise 1 is, essentially, the Aristotelian definition of human nature. I exposed, and attempted to defend this definition in blog series mentioned above, and, so, I will not take the time to defend it here.

Premise 2 follows upon premise 1. I use the terms actually and potency in the Aristotelian sense, where that which is in potency to A, does not actually possess, or is not actually in a state of, A; but, that which is in potency to A, due to its form or nature, and given a certain maturity and properly functioning organs, will possess, or be capable of being in a state of, A. So, for example, though an acorn is not yet a tree, it is in potency to be a tree. Though a child is not yet an adult, it is in potency to being an adult and in potency to all of the capacities that an adult has. In fact, a human person who is in a coma is also in potency to rational thought. The term actually, or, in other words, to be in act, refers to the fact that, if something is actually A, then it is in possession of, or is currently in a state of, A. So, the acorn is in potency to being a tree, but it is actually an acorn (a nut). A child is in potency to being an adult, but it is actually a child.  With these concepts in mind, premise 2 is simply stating that a being with a rational form is either actually in the act of reasoning (such as I am right now, and as the reader is as they read these words), or said being is not actually reasoning at the time being, though they are in potency to the act of reasoning, such as a person who is sleeping or is in a coma, or a one year old child who cannot yet reason, or the substance created by human fertilization.

Premise 3 is, perhaps, a point of friction; however, it follows upon premise 2, and it is based upon 2 facts. First of all, though the substance that is created by the fertilization of a human egg by a human sperm is not actually capable of reasoning, it is in potency to the act of reasoning. This is an empirical observation based upon the fact that, unless the substance which is the result of human fertilization dies prematurely, or has malfunctioning hardware, it inevitably is not only capable of reasoning, but will spend most of its waking hours involved in some form of reasoning. Secondly, based upon our definition of potency, if it is not actually reasoning, but will be able to reason, then it is in potency to rational thought. There may be a problem here: do we say that a thing is in potency to rationality because it has a rational form, or do we say that a thing has a rational form because it is actually in the process of reasoning, or is in potency to rational thought? This is an interesting question. For the time being, anyways, I am of the opinion that when we say that something has a rational form we are performing an act of classification. Therefore, though form precedes rationality in the substance itself (metaphysically), the observation of rationality (actually or only potentially) in a subject precedes the categorization (epistemologically). For Aristotle, the form is in the thing itself, and our classification of things into their various genus’s and species is an act of the intellect. Things are what they are due to their form; we know that they are what they are due to the intellect’s abstraction of the form from its observation of the thing. Therefore, the above problem is not really a problem; it simply brings up the distinction that we have just made. The answer to the dilemma above is “yes”.

As noted above, Premise 4 follows upon Premise 3 epistemologically. Though, we could, it seems, change the order of these two premises without greatly affecting the argument, if we wanted to put more emphasis upon the metaphysical nature of the substance in question than on our knowledge of its nature. Is the argument, therefore, circular? It does not seem to be circular; neither does it seem to beg the question. Rather, the first four premises seem to be the result of empirical observation.

Premise 5 is the conclusion of the first 4 premises, and if the first four premises are true, then Premise 5 would appear to follow necessarily. Now, as the following premises would appear to demonstrate, if premise 5 follows upon premises 1-4, then we are put into a nasty situation as regards abortion, at any stage of development from fertilization on.

Premise 6 is a simple definition of pre-meditated murder. Perhaps someone would want to add certain nuances; however, I believe that this definition gives an appropriate summary of what is generally viewed as pre-meditated murder. (Exceptions are simply that, exceptions. They do not remove the fact of the general observation.)

Premise 7 is assumed for the logical argument, but it is a fact of modern reality. Every day (and I am sorry if I under-estimate the number) thousands of abortions are carried out, around the world, at almost every stage of the development of the substance that is caused by human fertilization. Usually, killing after birth is seen as murder, and treated as such, however, doctors, patients, politicians, and activists, seem to be able to find reasons to rationalize killing the substance in question at any stage of its development. Therefore, premise 7 is not really up for debate here.

Premise 8 is simply the conclusion of premises 1-7. Logically it seems to follow, and if I have been successful, then this argument is not only logically valid, but it is also sound, and, therefore, the conclusion is also true.

I guess I will leave it up to the reader to decide what to do with this argument.


[1]I will be using, as much as possible, the term substance created by human fertilization to refer to the being that is the fusion of the sperm and the egg, rather than less morally neutral terms such as: human baby, human fetus, etc. This will not be satisfactory for those who are pro-life activists, who will probably say that I’m giving too much to the pro-choice activists. Please forgive me for this; if someone so desires, they may read baby, or human fetus into the text, it won’t change the effect of the argument. For the more philosophically minded, the term substance is indeed a highly debated term. I use this term in the Aristotelian sense in which it means, more or less, the actually existing thing or, a being that is endowed with a certain nature. I stay as far away as possible from the Lockean definition of substance as the substratum of a thing which is unknowable. When we see a human with brown hair, that is 6’6” walking down the street, we are immediately aware of its accidents, but this awareness is only possible if we are simultaneously aware of its substance, the being that has the accidents and that is endowed with a human nature.

[2]For those who don’t have time to read my blog series in human nature, this argument is based upon an Aristotelian conception of human nature, and, as such, this is not a religious argument.

[3]I am not presupposing any religious claims.

           [4]The Argument seems to work out as follows (Any comments would be appreciated):



1. ∀x (Hx↔Rx) A

2. ∀x (Rx ↔(Tx v Px) A

3. ∀x ((Kx & Hx) → Mx) A

4. Pf PA

5. Hf ↔ Rf 1∀O

6. Rf ↔(Tf v Pf) 2∀O

7. (Tf v Pf) → Rf 6↔O

8. Tf PA

9. Tf v Pf 4vI

10. Rf 7,9→O

11. Tf→Rf 8-10vI

12. Rf→Hf 5↔O

13. Hf 10,12→O

14. Pf→Hf 4-13→I

15. Kf PA

16. (Kf & Hf)→Mf 3∀O

17. Kf & Hf 13, 15&I

18. Mf 16,17→O

19. Kf→Mf 15-18→I

Domain Key :
Hx = x is a human
Rx = x possesses a Rational Form
Tx = x is actually thinking rationally
Px = x is in potency to rational thought
Kx = x is killed according to a plan
Mx = x is the victim of a pre-meditated murder
            F = the substance created by human fertilization


Popular posts from this blog

How Kant’s Synthesis of Empiricism and Rationalism resulted in Agnosticism

Immanuel Kant, presented with the extreme empiricism of Hume and the extreme rationalism of Liebniz, which he discovered through the writings Wolff, sought to take a middle road between these two extreme philosophical positions. I would submit that Kant’s synthesis of these two views leads to an agnosticism about what Kant called “the thing-in-itself”, and ultimately to the philosophical positions known as Atheism, determinism, and nihilism.


Kant’s Sources
First of all, Kant was influenced by Hume’s empiricism and Newton’s physics. He saw that the physical sciences, in contrast to rationalistic metaphysics, were actually making advances. They were making discoveries, and building a system of knowledge that accurately described the world of our sense perceptions. Rationalistic metaphysics, on the other hand, was floundering amidst the combating systems that the philosophers were erecting. It did not provide new knowledge, and only led to unacceptable conclusions, such as the Absolute Mon…

A Short outline of Charles Taylor's: The Malaise of Modernity

CHARLES TAYLOR’S THE MALAISE OF MODERNITY[1]
            This is simply an outline of Taylor’s basic argument in this short work written by Charles Taylor. The idea of this outline is to help the reader understand the book by providing a simple outline of the basic argument that Taylor is presenting here. The book, which is essentially the manuscript is the fruit of a series of presentations that Taylor made at the Massey Conferences which are hosted by Massey College and Radio-Canada, is divided into 10 chapters. In the first chapter Taylor essentially proposes three causes (recognizing that there may be more) of the Malaise of Modernity: (1) Individualism or the Loss of Sense, (2) The Primacy of Instrumental Reason or the Loss of Ends, and (3) The effect on society and politics in general of the loss of sense to an inauthentic individualism and the domination of instrumental reason, or, the loss of true freedom. Taylor considers the first Malaise in chapters 2 to 8, the second in c…

LEISURE: THE BASIS OF CULTURE – A BOOK REVIEW

Leisure: The Basis of Culture & the Philosophical Act. Josef Pieper. Translated by Alexander Dru. 1963. Reprint, Ignatius Press, 2009. 143 pp. $12.99. ISBN 978-1-58617-256-5.
            This book is composed of two articles written by the German philosopher Josef Pieper. Though the two articles are intimately connected, they form two distinct works; as such, this book review will begin by giving a brief introduction to the works in question, followed by and exposition of each of the works individually. The two articles that are included in this book, Leisure: the Basis of Culture and The Philosophical Act, were both published in 1947, and, as such, were written during the cultural crisis in Germany that followed the Second World War. Not only did Pieper have the cultural crisis in mind when he wrote these articles, but he was also writing in light of the works of the most well-known German philosopher of the time – Martin Heidegger. As such, any reader who is familiar with Heidegg…