People who honestly mean to be true really contradict themselves much more rarely than those who try to be 'consistent'.

What refuge is there for the victim who is oppressed with the feeling that there are a thousand new books he ought to read, while life is only long enough for him to attempt to read a hundred?

Science is the topography of ignorance.

A moment's insight is sometimes worth a life's experience.

Insanity is often the logic of an accurate mind overtasked. Good mental machinery ought to break its own wheels and levers, if anything is thrust among them suddenly which tends to stop them or reverse their motion. A weak mind does not accumulate force enough to hurt itself; stupidity often saves a man from going mad.

Science is a first-rate piece of furniture for a man's upper chamber, if he has common sense on the ground-floor. But if a man hasn't got plenty of good common sense, the more science he has, the worse for his patient.

The mind of a bigot to the pupil of the eye; the more light you pour on it, the more it contracts.