Who knows the deeps, where the water sleeps
Leagues from the light away?
Who knows the heights, where myriad lights
Fill heaven with endless day?

The earth goes on—seeks and loses the sun,
And men in the changes delight;
Love whirls us away into changeless day,
Or whelms us in changeless night.

Francis William Bourdillon

http://www.poemhunter.com/poem/the-regions-of-love/