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.

He who possesses art and science has religion; he who does not possess them, needs religion.

If you want someone to develop a specific trait, treat them as though they already had it.

Science and art belong to the whole world, and before them vanish the barriers of nationality.

Our passions are the true phoenixes; when the old one is burnt out, a new one rises from its ashes.

The proper place for liberality is in the realm of the emotions.

All lyrical work must, as a whole, be perfectly intelligible, but in some particulars a little unintelligible.