In books lies the soul of the whole past time.

Get the facts first. You can distort them later.

Back off man, I'm a scientist.

Wise men speak because they have something to say; Fools because they have to say something.

How incessant and great are the ills with which a prolonged old age is replete.

You must not fight too often with one enemy, or you will teach him all your art of war.