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Without passion man is a mere latent force and possibility, like the flint which awaits the shock of the iron before it can give forth its spark

There is no passion that steals into the heart more imperceptibly and covers itself under more disguises than pride

Every production of genius must be the production of enthusiasm

We should employ our passions in the service of life, not spend life in the service of our passions.

Put your hand on a hot stove for a minute, and it seems like an hour. Sit with a pretty girl for an hour, and it seems like a minute. That's relativity

All the passions are nothing else than different degrees of heat and cold of the blood.