What is philosophy but a continual battle against custom?

Old age is not a matter for sorrow. It is matter for thanks if we have left our work done behind us.

The only happiness a brave person ever troubles themselves in asking about, is happiness enough to get their work done.

Philosophy dwells aloft in the Temple of Science, the divinity of its inmost shrine; her dictates descend among men, but she herself descends not : whoso would behold her must climb with long and laborious effort, nay, still linger in the forecourt, till manifold trial have proved him worthy of admission into the interior solemnities.

No person is important enough to make me angry.

Wise man was he who counselled that speculation should have free course, and look fearlessly towards all the thirty-two points of the compass, whithersoever and howsoever it listed.

No mortal has a right to wag his tongue, much less to wag his pen, without saying something.