Trade is a social act.

To refuse a hearing to an opinion, because they are sure that it is false, is to assume that their certainty is the same thing as absolute certainty. All silencing of discussion is an assumption of infallibility.

Among the works of man, which human life is rightly employed in perfecting, the first in importance surely is man himself.

Whatever helps to shape the human being - to make the individual what he is, or hinder him from being what he is not - is part of his education.

A [psychological] difficulty is not an impossibility.

I confess that I am not charmed with the ideal of life held out by those who think that the normal state of human beings is that of struggling to get on; that the trampling, crushing, elbowing, and treading on each other's heels, which form the existing type of social life, are the most desirable lot of human beings

The only purpose for which power can be rightfully exercised over any member of a civilized community, against his will, is to prevent harm to others. His own good, either physical or moral, is not sufficient warrant.