Reason Without Cause

Definition

Explanation and causation are not the same relation. A cause produces its effect through some prior efficient act; a reason (ratio) accounts for why something is so or why an agent wills something, without that account being a productive act at all. This distinction lets philosophers explain a self-existing or uncaused first principle without contradicting themselves by making it the efficient cause of its own existence.

In the Book

Wippel's chapter on Aquinas (Ch. 4) builds directly on this move. Asked why God creates at all, Aquinas holds that God's goodness is the reason God wills other things to exist, but explicitly not the cause of that willing — Wippel traces this to Aquinas's own text (Summa Contra Gentiles I, c. 86–87), which "introduces an interesting distinction between a ratio and a cause." Pressed further — why does God himself exist? — Wippel argues Aquinas would say God's essence is identical to his act of existing, so God necessarily exists; this, Wippel concludes, "is in fact for him to offer a reason (ratio) for God's existence, but not a cause," since "there is, in the case of his existence, a reason without an efficient cause."

Tad Schmaltz's chapter on Descartes (Ch. 5) shows the same distinction under strain. Descartes wants a "cause or reason" for everything, including God, and initially calls God causa sui — cause of himself. Pressed by Arnauld's objection that nothing can efficiently cause itself, Descartes retreats: God stands to his own existence only "in some manner [quodammodo]" as an efficient cause stands to its effect, invoking a formal-cause analogy instead (quasi causa efficiens). Schmaltz reads Descartes's final position, despite the strained terminology, as landing in the same place as Aquinas: a reason for God's existence that is not an (efficient) cause of it.

Why It Matters

Any explanatory chain that must terminate — a first cause, an axiom, a founding assumption — faces the same problem: the terminus can't be explained the same way as everything downstream of it without infinite regress or self-causation. "Reason without cause" is the move that lets a chain stop without becoming either arbitrary or self-caused: the terminus is accounted for, just not produced. The same shape shows up wherever an explanation needs to bottom out — in why a formal system's axioms hold, or why a foundational value in a design is what it is — without smuggling in a hidden earlier cause.