Histories make men wise; poets, witty; the mathematics, subtle; natural philosophy, deep; moral, grave; logic and rhetoric, able to contend.

… for it is very probable, that the motion of gravity worketh weakly, both far from the earth, and also within the earth: the former because the appetite of union of dense bodies with the earth, in respect of the distance, is more dull: the latter, because the body hath in part attained its nature when it is some depth in the earth.{Foreshadowing Isaac Newton's Universal Law of Gravitation (1687)}

Wonder is the seed of knowledge

A little philosophy inclineth man's mind to atheism, but depth in philosophy bringeth men's minds about to religion

They are ill discoverers that think there is no land, when they can see nothing but sea.

For all knowledge and wonder (which is the seed of knowledge) is an impression of pleasure in itself.

Aristotle... a mere bond-servant to his logic, thereby rendering it contentious...

Aristippus said: That those that studied particular sciences, and neglected philosophy, were like Penelope's wooers, that made love to the waiting women.

If a man will begin with certainties, he shall end in doubts; but if he will be content to begin with doubts he shall end in certainties