Though friendships differ endless in degree , <br /> The sorts , methinks, may be reduced to three. <br /> Ac quaintance many, and Con quaintance few; <br /> But for In quaintance I know only two-- <br /> The friend I've mourned with, and the maid I woo!<br /><br />Samuel Taylor Coleridge<br /><br />http://www.poemhunter.com/poem/the-three-sorts-of-friends-fragment/