As a science, logic institutes an analysis of the process of the mind in reasoning, and investigating the principles on which argumentation is conducted; as an art, it furnishes such rules as may be derived from those principles, for guarding against erroneous deductions.

Not in books only, nor yet in oral discourse, but often also in words there are boundless stores of moral and historic truth, and no less of passion and imagination laid up, from which lessons of infinite worth may be derived.

The more secure we feel against our liability to any error to which, in fact, we are liable, the greater must be our danger of falling into it.

When men have become heartily wearied of licentious anarchy, their eagerness has been proportionately great to embrace the opposite extreme of rigorous despotism.

There is no right faith in believing what is true, unless we believe it because it is true.

Superstition is not, as has been defined, an excess of religious feeling, but a misdirection of it, an exhausting of it on vanities of man's devising.

Neither human applause nor human censure is to be taken as the best of truth; but either should set us upon testing ourselves.