One can only define the unknown by its supposed and supposable relations with the known.

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.

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?

It is necessary to DARE what must be attempted.

There is nothing more to controlling demons than to do good and fear nothing.

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.

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