All intelligent thoughts have already been thought what is necessary is only to try to think them again.

All the knowledge I possess everyone else can acquire, but my heart is all my own.

Doubt grows with knowledge.

We know accurately only when we know little, with knowledge doubt increases.

I love those who yearn for the impossible.

What is important in life is life, and not the result of life.

Character develops itself in the stream of life.

It is not doing the thing we like to do, but liking the thing we have to do, that makes life blessed.

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

Life belongs to the living, and he who lives must be prepared for changes.