After all manner of professors have done their best for us, the place we are to get knowledge is in books.

Coining "Dismal Science" as a nickname for Political Economy

Our works are the mirror wherein the spirit first sees its natural lineaments. Hence, too, the folly of that impossible precept, Know theyself; till it be translated into this partially possible one, know what thou canst work at.

Nothing ever happens but once in all this world. What I do now I do once for all. It is over and gone, with all its eternity of solemn meaning.

A poor creature who has said or done nothing worth a serious man taking the trouble of remembering.

If there be not a religious element in the relations of men, such relations are miserable and doomed to ruin.

The lies (Western slander) which well-meaning zeal has heaped round this man (Muhammad) are disgraceful to ourselves only.