In fact, it is as difficult to appropriate the thoughts of others as it is to invent

Only an inventor knows how to borrow, and every man is or should be an inventor. - Ralph Waldo Emerson,

Beware when the great God lets loose a thinker on this planet.

In every work of genius we recognize our own rejected thoughts: they come back to us with a certain alienated majesty.

Beware when the great God lets loose a thinker on this planet. Then all things are at risk.

We sometimes meet an original gentleman, who, if manners had not existed, would have invented them