A cultivated mind is one to which the fountains of knowledge have been opened, and which has been taught, in any tolerable degree, to exercise its faculties.

Although it is not true that all conservatives are stupid people, it is true that most stupid people are conservative.

A person's taste is as much his own peculiar concern as his opinion or his purse.

To think that because those who wield power in society wield in the end that of government, therefore it is of no use to attempt to influence the constitution of the government by acting on opinion, is to forget that opinion is itself one of the greatest active social forces. One person with a belief is a social power equal to ninety-nine who have only interests.

There are no means of finding what either one person or many can do, but by trying - and no means by which anyone else can discover for them what it is for their happiness to do or leave undone

It appears, then, to be a condition of a genuinely scientific hypothesis, that it be not destined always to remain an hypothesis, but be certain to be either proved or disproved by.. .comparison with observed facts.

Trade is a social act. Whoever undertakes to sell any description of any goods to the public, does what affects the interest of other persons, and of society in general; and thus his conduct, in principal, comes within the jurisdiction of society.