Hypotheses are the scaffolds which are erected in front of a building and removedd when the building is completed. They are indispensable to the worker; but the worker must not mistake the scaffolding for the building.

Oh how sweet it is to hear one's own convictions from another's lips.

Properly speaking, such work is never finished; one must declare it so when, according to time and circumstances, one has done one's best.

People should talk less and draw more. Personally, I would like to renounce speech altogether and, like organic nature, communicate everything I have to say visually.

Who are you then?" "I am part of that power which eternally wills evil and eternally works good.

The deed is everything, the glory is naught.

The greater part of all the mischief in the world arises from the fact that men do not sufficiently understand their own aims.