The sincere alone can recognize sincerity.

Coining "Dismal Science" as a nickname for Political Economy

Let him who gropes painfully in darkness or uncertain light, and prays vehemently that the dawn may ripen into day, lay this precept well to heart: "Do the duty which lies nearest to thee," which thou know to be a duty! Thy second duty will already have become clearer.

Men seldom, or rather never for a length of time and deliberately, rebel against anything that does not deserve rebelling against.

All that mankind has done, thought or been: it is lying as in magic preservation in the pages of books.

Let a man try faithfully, manfully to be right; he will grow daily more and more right. It is at bottom the condition on which all men have to cultivate themselves.

In a different time, in a different place, it is always some other side of our common human nature that has been developing itself. The actual truth is the sum of all these.