It's a long prose piece, sometimes printed as if it were a poem.
You can read the whole thing at:
[
www.incompetech.com]
The "short version" is just an excerpt from it:
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 bell tolls; it tolls for thee.
YOU MAY ALSO have seen "shorter versions" that are actually adaptations. There's at least one SONG LYRIC based on this essay ("Devotions" #17). The one I sang in high school started this way:
No man is an island
No man stands alone
Each man's joy is joy to me
Each man's grief is my own
We need one another...