There is no such thing as perpetual tranquillity of mind while we live here; because life itself is but motion, and can never be without desire, nor without fear, no more than without sense.

I put for the general inclination of all mankind, a perpetual and restless desire of power after power, that ceaseth only in death.

Desire to know why, and how - curiosity, which is a lust of the mind, that a perseverance of delight in the continued and indefatigable generation of knowledge - exceedeth the short vehemence of any carnal pleasure.

They that approve a private opinion, call it opinion; but they that dislike it, heresy; and yet heresy signifies no more than private opinion.

During the time men live without a common power to keep them all in awe, they are in that conditions called war; and such a war, as if of every man, against every man.

The condition of man . . . is a condition of war of everyone against everyone.