What a man does not understand, he does not possess.

The realization of the self is only possible if one is productive, if one can give birth to one's own potentialities.

We rather confess our moral errors, faults, and crimes than our ignorance.

Nothing is worth more than this day. You cannot relive yesterday. Tomorrow is still beyond your reach.

The heights charm us, but the steps do not; with the mountain in our view we love to walk the plains.

Live dangerously and you live right.

Whether one show one's self a man of genius in science or compose a song, the only point is, whether the thought, the discovery, the deed, is living and can live on.