How can we know ourselves? Never by reflection, but only through action. Begin at once to do your duty and immediately you will know what is inside you.

Mediocrity has no greater consolation than in the thought that genius is not immortal.

Doubt grows with knowledge.

It is so hard that one cannot really have confidence in doctors and yet cannot do without them.

A rainbow which lasts for a quarter of an hour is looked at no longer.

All beginnings are delightful; the threshold is the place to pause.

To have a positive religion is not necessary. To be in harmony with yourself and the universe is what counts, and this is possible without positive and specific formulation in words.