We learn from history that we learn nothing from history.

Discussing vaccination with a doctor is like discussing vegetarianism with a butcher.

All progress depends upon the unreasonable person.

Why, except as a means of livelihood, a man should desire to act on the stage when he has the whole world to act in, is not clear to me.

The love of economy is the root of all virtue.

I ... must continue to strive for more knowledge and more power, though the new knowledge always contradicts the old and the new power is the destruction of the fools who misuse it.

The British churchgoer prefers a severe preacher because he thinks a few home truths will do his neighbors no harm.