Both teachers and learners go to sleep at their post as soon as there is no enemy in the field.

Almost all rich veins of original and striking speculation have been opened by systematic half-thinkers.

The successful conduct of an industrial enterprise requires two quite distinct qualifications: fidelity and zeal.

The United States is no more a Christian nation because most of its citizens are Christians than it is a 'white' nation because most of its citizens are white. We are Americans because we practice democracy and believe in republican government, not because we practice revealed religion and believe in Bible-based government.

The peculiar evil of silencing the expression of an opinion is, that it is robbing the human race; posterity as well as the existing generation; those who dissent from the opinion, still more than those who hold it. If the opinion is right, they are deprived of the opportunity of exchanging error for truth: if wrong, they lose, what is almost as great a benefit, the clearer perception and livelier impression of truth, produced by its collision with error.

All action is for the sake of some end; and rules of action, it seems natural to suppose, must take their whole character and color from the end to which they are subservient.

There is no 'one-size-fits-all' way to build an audience.