With the growth of knowledge our ideas must from time to time be organized afresh. The change takes place usually in accordance with new maxims as they arise, but it always remains provisional.

Power is neither male nor female.

The highest happiness of man ... is to have probed what is knowable and quietly to revere what is unknowable.

It is not given to us to grasp the truth, which is identical with the divine, directly. We perceive it only in reflection, in example and symbol, in singular and related appearances. It meets us as a kind of life which is incomprehensible to us, and yet we cannot free ourselves from the desire to comprehend it.

Love and desire are the spirit's wings to great deeds.

Plunge boldly into the thick of life!

This is the highest wisdom that I own; freedom and life are earned by those alone who conquer them each day anew.