Fertilization of the soul is the reason for the necessity of art.

The deepest definition of youth is life as yet untouched by tragedy.

The guiding motto in the life of every natural philosopher should be, seek simplicity and distrust it.

By relieving the brain of all unnecessary work, a good notation sets it free to concentrate on more advanced problems, and in effect increases the mental power of the race.

The way in which the persecution of Galileo has been remembered is a tribute to the quiet commencement of the most intimate change in outlook which the human race had yet encountered. Since a babe was born in a manger, it may be doubted whether so great a thing has happened with so little stir

How the past perishes is how the future becomes.

You cannot be wise without some basis of knowledge, but you may easily acquire knowledge and remain bare of wisdom.