It is necessary to DARE what must be attempted.

Fear is nothing but idleness of the will.

EVERY intention which does not assert itself by deeds is a vain intention, and the speech which expresses it is idle speech. It is action which proves life and establishes will

If you wish to seduce an angel, you must play the part of a devil.

There exists in nature a force which is immeasurably more powerful than steam, and by means of which a single man, who knows how to adapt and direct it, might upset and alter the face of the world.

In olden times gold was manufactured by science; nowadays science must be renewed by gold. We have fixed the volatile and we must now volatilize the fixed—in other words, we have materialized spirit, and we must now spiritualize matter.

Doubt is really a groping ignorance.