It is rightly laid down that 'true knowledge is knowledge by causes'. Also the establishment of four causes is not bad: material, formal, efficient and final.

Knowledge hath in it somewhat of the serpent, and therefore where it entereth into a man it makes him swell.

No artist knows in his own lifetime whether what he does will be the slightest good, because it takes at least seventy-five to a hundred years before the thing begins to sort itself out.

My praise shall be dedicated to the mind itself. The mind is the man, and the knowledge is the mind. A man is but what he knoweth. The mind is but an accident to knowledge, for knowledge is the double of that which is.

Nothing is to be feared but fear.

Truth can never be reached by just listening to the voice of an authority.

Take an arrow, and hold it in flame for the space of ten pulses, and when it cometh forth you shall find those parts of the arrow which were on the outsides of the flame more burned, blacked, and turned almost to coal, whereas the midst of the flame will be as if the fire had scarce touched it. This is an instance of great consequence for the discovery of the nature of flame; and sheweth manifestly, that flame burneth more violently towards the sides than in the midst.