Cannot we let [children] be themselves, and enjoy life in their own way? You are trying to make another you. One's enough.

There are no fixtures in nature. The universe is fluid and volatile. Permanence is but a word of degrees.

There is no good theory of disease which does not at once suggest a cure.

But do your work, and I shall know you. Do your work, and you shall reinforce yourself.

When nature removes a great man, people explore the horizon for a successor; but none comes, and none will. His class is extinguished with him. In some other and quite different field, the next man will appear.

Almost every man we meet requires some civility; requires to be humored; - he has some fame, some talent, some whim of religion or philanthropy in his head that is not to be questioned, and which spoils all conversation with him. But a friend is a sane man who exercises not my ingenuity, but me.

Every vice is only an exaggeration of a necessary and virtuous function.