The 'Origin of Love!'--Ah why
That cruel question ask of me,
When thou may'st read in many an eye
He starts to life on seeing thee?
And should'st thou seek his end to know:
My heart forebodes, my fears foresee
He'll linger long in silent woe;
But live--until I cease to be.
George Gordon Byron
http://www.poemhunter.com/poem/on-being-asked-what-was-the-origin-of-love/