If a man's wit be wandering, let him study the mathematics; for in demonstrations, if his wit be called away never so little, he must begin again.

He that cometh to seek after knowledge, with a mind to scorn, shall be sure to find matter for his humour, but no matter for his instruction.

Nature is often hidden, sometimes overcome, seldom extinguished.

I do not believe that any man fears to be dead, but only the stroke of death.

A principal fruit of friendship, is the ease and discharge of the fullness and swellings of the heart, which passions of all kinds do cause and induce.

It was well said that envy keeps no holidays.

Since my logic aims to teach and instruct the understanding, not that it may with the slender tendrils of the mind snatch at and lay hold of abstract notions (as the common logic does), but that it may in very truth dissect nature, and discover the virtues and actions of bodies, with their laws as determined in matter; so that this science flows not merely from the nature of the mind, but also from the nature of things.