Those who are enamoured of practice without science are like a pilot who goes into a ship without rudder or compass and never has any certainty of where he is going. Practice should always be based upon a sound knowledge of theory.

life without love, is no life at all

Men of genius sometimes accomplish most when they work least, for they are thinking out inventions.

He who has access to the fountain does not go to the water-pot.

The eye encompasses the beauty of the whole world.

Truth at last cannot be hidden. Dissimulation is of no avail. Dissimulation is to no purpose before so great a judge. Falsehood puts on a mask. Nothing is hidden under the sun.

Nature never breaks her own laws.