Edward Estlin Cummings - it may not always be so

it may not always be so; and i say
that if your lips, which i have loved, should touch
another's, and your dear strong fingers clutch
his heart, as mine in time not far away;
if on another's face your sweet hair lay
in such a silence as i know, or such
great writhing words as, uttering overmuch,
stand helplessly before the spirit at bay;

if this should be, i say if this should be --
you of my heart, send me a little word;
that i may go unto him, and take his hands,
saying, Accept all happiness from me.
Then shall i turn my face, and hear one bird
sing terribly afar in the lost lands.

Edward Estlin Cummings

http://www.poemhunter.com/poem/it-may-not-always-be-so-2/