Fear is nothing but idleness of the will.

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

A good teacher must be able to put himself in the place of those who find learning hard.

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.

To practice magic is to be a quack; to know magic is to be a sage.

All miracles are promised to faith, and what is faith except the audacity of will which does not hesitate in the darkness, but advances towards the light in spite of all ordeals, and surmounting all obstacles?

Doubt is really a groping ignorance.