[Every age], however destitute of science or virtue, sufficiently abounds with acts of blood and military renown.

Every person has two educations, one which he receives from others, and one, more important, which he gives to himself.

The science of the church is neglected for the study of geometry, and they lose sight of Heaven while they are employed in measuring the earth. Euclid is perpetually in their hands. Aristotle and Theophrastus are the objects of their admiration; and they express an uncommon reverence for the works of Galen. Their errors are derived from the abuse of the arts and sciences of the infidels, and they corrupt the simplicity of the gospel by the refinements of human reason.

The nations, and the sects, of the Roman world, admitted with equal credulity, and similar abhorrence, the reality of that infernal art [witchcraft], which was able to control the eternal order of the planets, and the voluntary operations of the human mind. . . . They believed, with the wildest inconsistency, that this preternatural dominion of the air, of earth, and of hell, was exercised, from the vilest motives of malice or gain, by some wrinkled hags and itinerant sorcerers, who passed their obscure lives in penury and contempt.

History should be to the political economist a wellspring of experience and wisdom.

Language is the leading principle which unites or separates the tribes of mankind.

In old age the consolation of hope is reserved for the tenderness of parents, who commence a new life in their children, the faith of enthusiasts, who sing hallelujahs above the clouds; and the vanity of authors, who presume the immortality of their name and writings.