Erin! the tear and the smile in thine eyes
Blend like the rainbow that hangs in thy skies,
Shining through sorrow's stream,
Saddening through pleasure's beam,
Thy suns with doubtful gleam,
Weep while they rise.

Erin, thy silent tear never shall cease,
Erin, thy languid smile ne'er shall increase,
Till, like the rainbow's light,
Thy various tints unite,
And form in heaven's sight
One arch of peace!

Thomas Moore

http://www.poemhunter.com/poem/erin-the-tear-and-the-smile-in-thine-eyes-2/