The highest problem of any art is to cause by appearance the illusion of a higher reality.

In all our academies we attempt far too much. ... In earlier times lectures were delivered upon chemistry and botany as branches of medicine, and the medical student learned enough of them. Now, however, chemistry and botany are become sciences of themselves, incapable of comprehension by a hasty survey, and each demanding the study of a whole life, yet we expect the medical student to understand them. He who is prudent, accordingly declines all distracting claims upon his time, and limits himself to a single branch and becomes expert in one thing.

No two people see the world exactly alike, and different temperaments will often apply the same principle, recognized by both, differently. Even one and the same person won't always maintain the same views and judgments: earlier convictions must give way to later ones.

One criticizes the English for carrying their teapots wherever they go, even lugging them up Mount Etna. But doesn't every nationhave its teapot, in which, even when traveling, it brews the dried bundles of herbs brought from home?

Science has been seriously retarded by the study of what is not worth knowing and of what is not knowable.

A man's foibles are what makes him lovable.

The world runs on from one folly to another; and the man who, solely from regard to the opinion of others, and without any wish or necessity of his own, toils after gold, honour, or any other phantom, is no better than a fool.