intelligible character

is a timeless act of will that the person essentially 'is', and it can be conceived of as the subjective aspect of the platonic idea that would objectively define the person's inner essence.

A person's intelligible character is a timeless act of Will that the person essentially is, and it can be conceived of as the subjective aspect of the Platonic Idea that would objectively define the person's inner essence (WWR, Section 28), as a portrait artist might perceive it. This concept of the intelligible character is Kantian (Critique of Pure Reason, A539/B567), and in conjunction with Kant's correlated concept of an empirical character (i.e., the intelligible character as it is experientially expressed) Schopenhauer regards it as a means to resolve the problem of freedom and determinism, and to be one of the most profound ideas in Kant's philosophy.

intelligible character, n.Definitions

intelligible character