I prefer the folly of enthusiasm to the indifference of wisdom.
We have drugs to make women speak, but none to keep them silent.
The wonder is, not that the field of stars is so vast, but that man has measured it.
The faculty of doubting is rare among men. A few choice spirits carry the germs of it in them, but these do not develop without training.
The mania of thinking renders one unfit for every activity.
Nine tenths of education is encouragement.