Believe me not, dear, when in hours of anguish
I say my love for thee exists no more.
At ebb of tide, think not the sea is faithless;
It will return with love unto the shore.

E'en now I pine for thee with old-time passion,
And place my freedom in thy hands once more.
Already, with loud noise, the waves are hasting
Back from afar to the beloved shore.

Aleksey Konstantinovich Tolstoy

http://www.poemhunter.com/poem/love-s-ebb-and-flow/