The greater part of human misery is caused by indolence.

If people should ever start to do only what is necessary millions would die of hunger.

If you are going to build something in the air it is always better to build castles than houses of cards.

To receive applause for works which do not demand all our powers hinders our advance towards a perfecting of our spirit. It usually means that thereafter we stand still.

Nowadays three witty turns of phrase and a lie make a writer.

Ask yourself always: how can this be done better?

Doubt must be no more than vigilance, otherwise it can become dangerous.