It would be necessary that they should be already sages to love wisdom...

It is not flesh and blood, but heart which makes us fathers and sons.

If you want to study yourself, look into the hearts of other people. If you want to study other people, look into your own heart.

Stubbornness is not firmness.

Mankind is made great or little by its own will.

Nothing, it is true, is more common than for both Science and Art to pay homage to the spirit of the age, and for creative taste to accept the law of critical taste.

Nothing leads to good that is not natural.