Nature knows no pause in progress and development, and attaches her curse on all inaction.

The errors of the observer come from the qualities of the human mind.

Only by joy and sorrow does a person know anything about themselves and their destiny. They learn what to do and what to avoid.

Everything is hard before it is easy.

It is natural to man to regard himself as the final cause of creation.

Sound and sufficient reason falls, after all, to the share of but few men, and those few men exert their influence in silence.

Once more I am a wanderer, a pilgrim, through the world. But what else are you?