The man of action has the present, but the thinker controls the future.

There are three natural anaesthetics: Sleep, fainting, and death.

We are all tattooed in our cradles with the beliefs of our tribe; the record may seem superficial, but it is indelible.

Most of the things we do, we do for no better reason than that our fathers have done them or our neighbors do them, and the same is true of a larger part than what we suspect of what we think.

We should be eternally vigilant against attempts to check the expression of opinions that we loathe.

Every idea is an incitement. It offers itself for belief, and if believed it is acted on unless some other belief outweighs it or some failure of energy stifles the movement at its birth. The only difference between the expression of an opinion and an incitement is the speaker's enthusiasm for the result.

Research and writing are lonely occupations. It is easy to become discouraged in solitary confinement.