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.

It is given to no human being to stereotype a set of truths, and walk safely by their guidance with his mind's eye closed.

Persons of genius are, ex vi termini, more individual than any other people - less capable, consequently, of fitting themselves, without hurtful compression, into any of the small number of moulds which society provides in order to save its members the trouble of forming their character.

Those only are happy who have their minds fixed on some object other than their own happiness; on the happiness of others, on the improvement of mankind, even on some art or pursuit, followed not as a means, but as itself an ideal end. Aiming thus at something else, they find happiness by the way.

Mechanizing man's work had changed but not lighted his toil.

The general tendency of things throughout the world is to render mediocrity the ascendant power among mankind.

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