Talk of the devil, and his horns appear.

It would not be correct to say that every moral obligation involves a legal duty; but every legal duty is founded on a moral obligation.

The curiosity of an honorable mind willingly rests there, where the love of truth does not urge it farther onward, and the love of its neighbor bids it stop; in other words, it willingly stops at the point where the interests of truth do not beckon it onward, and charity cries, Halt!

Often do the spirits stride on before the event; and in today already walks tomorrow.

Some men are like musical glasses; to produce their finest tones you must keep them wet.

A great mind must be androgynous.

Whenever philosophy has taken into its plan religion, it has ended in skepticism; and whenever religion excludes philosophy, or the spirit of free inquiry, it leads to willful blindness and superstition.