Henry Van Dyke - Undine

'T was far away and long ago,
When I was but a dreaming boy,
This fairy tale of love and woe
Entranced my heart with tearful joy;
And while with white Undine I wept,
Your spirit, -- ah, how strange it seems, --
Was cradled in some star, and slept,
Unconscious of her coming dreams.

Henry Van Dyke

http://www.poemhunter.com/poem/undine/