the mind. But that whereby this principle animates the soul, the material which it applies to that [purpose], is that which puts the mental powers purposively into swing, i.e. into such a play as maintains itself and strengthens the [mental] powers in their exercise.

Now I maintain that this principle is no other than the faculty of presenting aesthetical Ideas. And by an aesthetical Idea I understand that representation of the Imagination which occasions much thought, without, however, any definite thought, i.e. any concept, being capable of being adequate to it; it consequently cannot be completely compassed and made intelligible by language. — We easily see that it is the counterpart (pendant) of a rational Idea, which conversely is a concept to which no