What is your substance, whereof are you made, <br /> That millions of strange shadows on you tend? <br /> Since everyone hath, everyone, one shade, <br /> And you, but one, can every shadow lend. <br /> Describe Adonis, and the counterfeit <br /> Is poorly imitated after you; <br /> On Helen's cheek all art of beauty set, <br /> And you in Grecian tires are painted new. <br /> Speak of the spring and foison of the year, <br /> The one doth shadow of your beauty show, <br /> The other as your bounty doth appear; <br /> And you in every blessed shape we know. <br /> In all external grace you have some part, <br /> But you like none, none you, for constant heart.<br /><br />William Shakespeare<br /><br />http://www.poemhunter.com/poem/sonnets-liii-what-is-your-substance-whereof-are/