Everything lives by movement, everything is maintained by equilibrium, and harmony results from the analogy of contraries; this law is the form of forms.

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

Passing beauties are only the fugitive reflections of the eternal. All beauty alters and all life melts away; in short, everything passes with marvelous rapidity; beautiful Helen of Troy has become a toothless skull, then a handful of dust, then 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 be rich is to give; to give nothing is to be poor; to live is to love; to love nothing is to be dead; to be happy is to devote oneself; to exist only for oneself is to damn oneself, and to exile oneself to hell.

When one creates phantoms for oneself, one puts vampires into the world, and one must nourish these children of a voluntary nightmare with one's blood, one's life, one's intellegence, and one's reason, without ever satisfying them.

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.