|
Getting your Trinity Audio player ready...
|
Why Beginnings Matter for Bioethics and Moral Courage
When does a human being begin to be? At first glance, the question seems simple, much as the question of when a person dies can seem simple. In reality, both stand at the center of the most urgent bioethical debates of our time. The question of human beginnings cannot be answered by biology alone, nor by metaphysics alone. Biology describes processes; metaphysics asks what kind of being is present. Moral theology then depends upon the answer. If a human being is present, justice is owed. If not, manipulation soon follows.
This is why the question of beginnings is so consequential. It is not an abstract puzzle for philosophers. It is the fault line beneath embryo experimentation, IVF, abortion, selective reduction, embryonic stem-cell research, and the broader modern struggle over cooperation with evil.
Norman Ford and Delayed Hominization
One of the most influential contemporary defenders of delayed hominization was Fr. Norman Ford, especially in his 1988 book When Did I Begin? Ford argued that although a new living entity comes into existence at fertilization, an individual human being does not yet exist until roughly two weeks later, around the appearance of the primitive streak. Before that point, he maintained, twinning remains possible, and individuation is therefore not yet secure.
This was no minor academic dispute. Ford’s position helped provide philosophical support for the now-famous fourteen-day rule permitting embryo experimentation. If there is not yet a human individual before that stage, then the early embryo becomes morally ambiguous—not a human being already present, but a being whose humanity remains somehow undecided.
That way of framing the beginning already concedes too much to a technological imagination. It treats the embryo not according to what it is, but according to what it can be shown to do. The question shifts from substantial being to observable thresholds. And once that shift is made, personhood becomes vulnerable to developmental benchmarks, functional criteria, and conditional recognition.
The embryo is no longer received as one of us from conception. It is evaluated as a possible human being awaiting later confirmation. That move changes everything. Although Ford later revised his position, his earlier work continues to be invoked in support of embryonic manipulation of many kinds.
St. Thomas, Aristotle, and the Human Soul
St. Thomas Aquinas is sometimes invoked in defense of delayed hominization because he inherited the Aristotelian embryology available in his time. On that older account, the developing embryo was not understood to be a fully human organism from the start. Rather, it was thought to pass through successive stages of life: first vegetative, then sensitive, and only later rational. “Hominization,” in this context, refers to the point at which the specifically human soul—the rational soul—is present. For Aristotle, and thus for Thomas on the basis of the biology then available, that moment did not occur immediately at conception, but only after the developing body had reached a sufficient degree of organization.
But once we understand what Thomas means by the human person, we can also see why the issue cannot be settled by simply repeating medieval biology. For Aquinas, a human being is neither a soul trapped in a body nor a body later inhabited by a soul. The human person is a substantial unity of body and soul: a hylomorphic unity of matter and form. The soul is the substantial form of the body, the principle of life, unity, and development. There is no human body without a human soul, and no human soul that is not the form of a human body.
This matters because substantial being does not admit of a gradual halfway state. A thing either exists as a unified substance or it does not. Accidental change may unfold gradually, but substantial generation does not. The metaphysical question, then, becomes precise: when does a new human substance begin to exist?
That is where modern embryology changes the discussion. Aristotle and the medievals lacked any knowledge of gametes, fertilization, genetic identity, or the embryo’s internally coordinated development from its first instant. They therefore assumed that the early embryo was not yet a unified human organism, but a living reality that only gradually became proportioned to rational life. Modern embryology denies that premise. It shows that from fertilization there already exists a new, integrated, self-directing organism of the human species.
If that is true, then the older theory of delayed hominization loses its biological foundation. The metaphysical principles of Aquinas remain, but their application must change in light of better science. If a new human organism is already present at fertilization, then it is more coherent to say that the human being is present from the beginning, rather than to imagine a merely biological precursor later becoming one. Modern embryology does not deny Thomistic metaphysics; it corrects the incomplete embryology once joined to it.
What Contemporary Embryology Shows
Contemporary embryology allows us to state the point with far greater precision. Even Ford himself, in his later work, no longer described fertilization as a loose association of parts gradually becoming one. Rather, sperm and ovum fuse, the gametes cease to exist as such, and a new organism begins: the zygote. What follows is not the assembly of a human being from the outside, but the unfolding of a new living being from within.
This new being is not a mere collection of cells. It exhibits coordinated and self-directed activity from the beginning. It initiates gene expression proper to itself. It regulates its own development internally. It does not behave as a part of the mother, nor as a mere aggregate, but as a distinct organism with its own intrinsic developmental trajectory.
From a Thomistic perspective, this matters immensely. A being that acts as an organized whole from within is not waiting for substantial unity to arrive later. Immanent causality—the capacity of a living thing to direct its own growth and activity from within—is a sign of living substance. The zygote is not merely being organized by something external. It is already an organized whole acting as one.
The Twinning Objection
Ford’s central argument depended on twinning. If an embryo can split into two individuals, he argued, it cannot yet be one individual. But that conclusion does not follow. The capacity to generate another individual does not negate one’s own individuality. An amoeba that divides is not therefore non-individual before division; it is one organism that gives rise to another. Twinning may reveal developmental plasticity, but it does not prove the absence of ontological unity. In Thomistic terms, generation presupposes substance. The power to generate another does not negate present being.
Ford also tried to distinguish the embryo proper from extra-embryonic structures such as the placenta. But from a Thomistic standpoint, this does not help unless one can show that these structures are not organically ordered to the good of the developing whole. An organ is not defined by permanence, but by function within an organized whole. Milk teeth are temporary. Hair is shed. Cells are constantly replaced. Yet all are genuinely parts of the organism. The placenta likewise is formed by the embryo, for the embryo, and serves the embryo’s development. It is therefore not evidence against substantial unity, but evidence of an organism already acting as one.
Finality and the Inner Logic of Development
Perhaps the strongest Thomistic argument concerns final causality. Aristotle and Aquinas both insist that natural substances act toward ends. Teleology is not something imposed upon living beings from the outside. It belongs to them from within.
The embryo displays just such an inner directedness from the beginning. Gene expression unfolds in ordered sequence. Cellular differentiation occurs in relation to the whole. Cells communicate and cooperate. Development is not random, but internally ordered toward maturation. If the end is virtually present at the beginning, then the principle directing that development must likewise be present from the beginning.
In Thomistic thought, that principle is the soul. It is not added later to a body already organized by some lesser principle. It is the substantial form that makes a living body to be the kind of body it is, directing its development from within from the first instant of its existence. For that reason, the older theory of delayed animation cannot simply be repeated today. Aristotle and the medievals were working with an incomplete embryology. Their metaphysical principles remain profound, but once the biological premise is corrected, the conclusion must be reconsidered. If a new human organism begins at fertilization, then it is most coherent to say that the human being—and thus the rational soul—is present from that beginning.
Why the Moral Stakes Are So High
The moral stakes are enormous. If the human substance begins at fertilization, then justice is owed from that moment. If not, moral protection becomes negotiable. That is why one of the most important distinctions in all pro-life reasoning is that the embryo is not a potential human being but a human being with potential.
That is not rhetoric. It is metaphysics. The potential in question is not the potential to become human, but the potential to develop as the kind of being one already is. An infant grows as a human being, not into one. So too the embryo develops as a human being, not toward becoming one.
The question of beginnings passes directly into moral theology. One cannot judge the morality of embryo destruction, experimentation, or manipulation without first answering the prior question, “What is the embryo?” Metaphysics therefore precedes moral analysis. If the embryo is a human being from fertilization, then what is done to it is not the disposal of biological material but the destruction of innocent human life.
That is why this debate matters so much. If we lose clarity about what a human being is and when one begins, we will soon lose clarity about what we may and may not do. Procedure will replace principle, sophistry and propaganda will replace truth, and the weakest human beings will be placed at the mercy of power.
To defend the beginning of the human person, then, is not merely to resolve a biological dispute. It is to safeguard the metaphysical foundation of human dignity. Only where that foundation remains clear can moral judgment remain clear as well.
Editor’s Note: This article is part of a CE original series on Bioethics & Culture by Fr. Francesco Giordano, tackling the challenging moral issues of our day.
Photo by Nathan Dumlao on Unsplash
