Curiosity is the lust of the mind.

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.

Temptation and curiosity are rational until irrationally acted upon.

Now it is quite true to say that curiosity, exactly like its analogue, lust, never ends and is never satisfied; but man was made for something more than this. He was made to rise, above curiosity and lust, to love, and through love to the attainment of truth.

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.

Ambition is a lust that is never quenched, but grows more inflamed and madder by enjoyment.