Acquaintance, n. A person whom we know well enough to borrow from, but not well enough to lend to.

How casually and unobservedly we make all our most valued acquaintances.

What causes us to like new acquaintances is not so much weariness of our old ones, or the pleasure of change, as disgust at not being sufficiently admired by those who know us too well, and the hope of being admired more by those who do not know so much about us.

Chance acquaintances are sometimes the most memorable, for brief friendships have such definite starting and stopping points that they take on a quality of art, of a whole thing, which cannot be broken or spoiled.