In the last decades, there has been a far-reaching debate about whether reason is a natural power of the human animal or a socio-historical achievement. This paper brings out and criticizes two paradigmatic views of reason entangled in that dilemma: the substantive view which construes reason as a primitive power possessing the basic forms of intelligibility; and the derivative view which traces back reason to non-rational, natural-historic processes. I approach the issue by discussing how

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... otle addresses the underlying predicament in Metaphysics Theta. The predicament persuades us to overdetermine or underdetermine our natural potentiality for reason because it ignores what I call Aristotle's main insight: the understanding from which rational capacities are exercised is acquired by undertaking appropriate activities. The measure of rational capacities is neither merely naturally determined nor merely socio-historically inherited but relies on the engagement with the things falling under the purview of the pertaining activities. We must recover this Aristotelian insight, I argue, to avoid succumbing to either the substantive or the derivative view of reason.