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

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.

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

Our headstrong passions shut the door of our souls against God.