Our necessities are few, but our wants are endless.

The desire to know is natural to good men.

Having wandered some distance among gloomy rocks, I came to the entrance of a great cavern ... Two contrary emotions arose in me: fear and desire--fear of the threatening dark cavern, desire to see whether there were any marvelous things in it.

Study without desire spoils the memory, and it retains nothing that it takes in.

There are four powers: memory and intellect, desire and covetousness. The two first are mental and the others sensual. The three senses sight, hearing, and smell cannot well be prevented; touch and taste not at all.

And there is deep down within all of us an instinct. It's a kind of drum major instinct - a desire to be out front, a desire to lead the parade, a desire to be first. And it is something that runs the whole gamut of life.