No man is an island, entire of itself; every man is a piece of the continent, a part of the main. If a clod be washed away by the sea, Europe is the less, as well as if a promontory were, as well as if a manor of thy friend’s or of thine own were: any man’s death diminishes me, because I am involved in mankind, and therefore never send to know for whom the bells tolls; it tolls for thee.
~ John Donne, 1624
Learn more about the essay by John Donne from which these famous lines were extracted in the ebook Devotions Upon Emergent Occasions archived in Project Gutenberg. It was first published in England, in 1624.