For many centuries, hugely influential thinkers in each of the Abrahamic faiths combined their foundational belief in an omnipotent deity with Aristotle’s framework of four kinds of causes. Many believers found solace when they discerned a divine role in the four causes.

Aristotle’s framework ran afoul of the Scientific Revolution. Today, there are still ways to be an Abrahamic believer who accepts science, and classical Indian thought offers some alternatives. Nevertheless the reduction of causes from Aristotle’s four to the two of modern science poses a spiritual and ethical challenge.

(This point is widely understood–and by no means my original contribution–but I thought the following summary might be useful for some readers.)

To illustrate Aristotle’s four causes, consider my hands, which are currently typing this blog post. Why are they doing that?

• Efficient cause: Electric signals are passing along nerves and triggering muscles to contract or relax. In turn, prior electrical and mechanical events caused those signals to flow–and so on, back through time.
• Material cause: My hand is made of muscles, nerves, skin, bones, and other materials, which, when so configured and stimulated, move. A statue’s hand that was made of marble would not move.
• Formal cause: A hand is defined as “the terminal part of the vertebrate forelimb when modified (as in humans) as a grasping organ” (Webster’s dictionary). I do things like grasp, point, and touch with my hand because it is a hand. Some hands do not do these things–for instance, because of disabilities–but those are exceptions (caused by efficient causes) that interfere with the definitive form of a hand.
• Final cause: I am typing in order to communicate certain points about Aristotle. I behave in this way because I see myself as a scholar and teacher whose words might educate others. In turn, educated people may live better. Therefore, I move my fingers for the end (telos, in Greek) of a good life.

Aristotle acknowledges that some events occur only because of efficient and material causes; these accidents lack ends. However, the four causes apply widely. For example, not only my hand but also the keyboard that I am using could be analyzed in terms of all four causes.

The Abrahamic thinkers who read Aristotle related the Creator to all the causes, but especially to the final cause (see Maimonides, Guide for the Perplexed, 2:1 or Aquinas, Summa Theologiae, I, Q44). In a well-ordered, divinely created universe, everything important ultimately happens for a purpose that is good. Dante concludes his Divine Comedy by invoking the final cause of everything, “the love that moves the sun and other stars.”

These Jewish and Christian thinkers follow the Muslim philosopher Avicenna, who even considers cases–like scratching one’s beard–that seem to have only efficient causes and not to happen for any end. “Against this objection, Avicenna maintains that apparently trivial human actions are motivated by unconscious desire for pleasure, the good of the animal soul” (Richardson 2020), which, in turn, is due to the creator.

However, writing in the early 1600s, Francis Bacon criticizes this whole tradition. He assigns efficient and material causes to physics, and formal and final causes to metaphysics. He gestures at the value of metaphysics for religion and ethics, but he doubts that knowledge can advance in those domains. His mission is to improve our understanding and control of the natural world. And for that purpose, he recommends that we keep formal and final causes out of our analysis and practice only what he calls “physics.”

It is rightly laid down that true knowledge is that which is deduced from causes. The division of four causes also is not amiss: matter, form, the efficient, and end or final cause. Of these, however, the latter is so far from being beneficial, that it even corrupts the sciences, except in the intercourse of man with man (Bacon, Novum Organum. P. F. Collier, 1620, II;2).

In this passage and others related to it, Bacon proved prescient. Although plenty of scientists after Bacon have believed in final causes, including divine ends, they only investigate efficient and material causes. Perhaps love moves all the stars, but in Newtonian physics, we strive to explain physical motion in terms of prior events and materials. This is a methodological commitment that yields what Bacon foresaw, the advancement of science.

The last redoubt of final causes was the biological world. My hand moves because of electrical signals, but it seemed that an object as complicated as a hand must have come into existence to serve an end. As Kant writes, “it is quite certain that in terms of purely mechanical principles of nature we cannot even adequately become familiar with, much less explain, organized beings and how they are internally possible.” Kant says that no Isaac Newton could ever arise who would be able to explain “how even a mere blade of grass is produced” using only “natural laws unordered by intention” (Critique of Judgment 74, Pluhar trans.). But then along came just such a Newton in the form of Charles Darwin, who showed that efficient and material explanations suffice in biology, too. A combination of random mutation plus natural selection ultimately yields objects like blades of grass and human hands.

A world without final causes–without ends–seems cold and pointless if one begins where Avicenna, Maimonides, and Aquinas did. One option is to follow Bacon (and Kant) by separating physics from metaphysics, aesthetics, and ethics and assigning the final causes to the latter subjects. Indeed, we see this distinction in the modern university, where the STEM departments deal with efficient causes, and final causes are discussed in some of the humanities. Plenty of scientists continue to use final-cause explanations when they think about religion, ethics, or beauty–they just don’t do that as part of their jobs.

However, Bacon’s warning still resonates. He suspects that progress is only possible when we analyze efficient and material causes. We may already know the final causes relevant to human life, but we cannot learn more about them. This is fine if everyone is convinced about the purpose of life. However, if we find ourselves disagreeing about ethics, religion, and aesthetics, then an inability to make progress becomes an inability to know what is right, and the result can be deep skepticism.

Michael Rosen (2022) reads both Rousseau and Kant as “moral unanimists”–philosophers who believe that everyone already knows the right answer about moral issues. But today hardly anyone is a “moral unanimist,” because we are more aware of diversity. Nietzsche describes the outcome (here, in a discussion of history that has become a science):

Its noblest claim nowadays is that it is a mirror, it rejects all teleology, it does not want to ‘prove’ anything any more; it scorns playing the judge, and shows good taste there, – it affirms as little as it denies, it asserts and ‘describes’ . . . All this is ascetic to a high degree; but to an even higher degree it is nihilistic, make no mistake about it! You see a sad, hard but determined gaze, – an eye peers out, like a lone explorer at the North Pole (perhaps so as not to peer in? or peer back? . . .). Here there is snow, here life is silenced; the last crows heard here are called ‘what for?’, ‘in vain’, ‘nada’ (Genealogy of Morals, Kaufman trans. 2:26)

Earlier in the same book, Nietzsche recounts how, as a young man, he was shaped by Schopenhauer’s argument that life has no purpose or design. But Nietzsche says he detected a harmful psychological consequence:

Precisely here I saw the great danger to mankind, its most sublime temptation and seduction – temptation to what? to nothingness? – precisely here I saw the beginning of the end, standstill, mankind looking back wearily, turning its will against life, and the onset of the final sickness becoming gently, sadly manifest: I understood the morality of compassion [Mitleid], casting around ever wider to catch even philosophers and make them ill, as the most uncanny symptom of our European culture which has itself become uncanny, as its detour to a new Buddhism? to a new Euro-Buddhism? to – nihilism? (Genealogy of Morals, Preface:6)

After mentioning Buddhism, Nietzsche critically explores the recent popularity of the great Buddhist virtue–compassion–in Europe.

Indeed, one of the oldest and most widely shared philosophical premises in Buddhism is “dependent origination,” which is the idea that everything happens because of efficient causes alone and not for teleological reasons. (I think that formal causes persist in Theravada texts but are rejected in Mahayana.)

Dependent origination is taken as good news. By realizing that everything we believe and wish for is the automatic result of previous accidental events, we free ourselves from these mental states. And by believing the same about everyone else’s beliefs and desires, we gain unlimited compassion for those creatures. Calm benevolence fills the mind and excludes the desires that brought suffering while we still believed in their intrinsic value. A very ancient verse which goes by the short title ye dharma hetu says (roughly): “Of all the things that have causes, the enlightened one has shown what causes them, and thereby the great renouncer has shown how they cease.”

I mention this argument not necessarily to endorse it. Much classical Buddhist thought presumes that a total release from the world of causation is possible, whether instantly or over aeons. If one doubts that possibility, as I do, then the news that there are no final causes is no longer consoling.

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Secondary sources: Richardson, Kara, “Causation in Arabic and Islamic Thought”, The Stanford Encyclopedia of Philosophy (Winter 2020 Edition), Edward N. Zalta (ed.); Michael Rosen, The Shadow of God: Kant, Hegel, and the Passage from Heaven to History, Harvard University Press, 2022. See also how we use Kant today; does skepticism promote a tranquil mind?; does doubting the existence of the self tame the will?; spirituality and science; and the progress of science.