Here are some good quotes for Saint Valentine's day:
At the touch of love, everyone becomes a poet.
Ah me! love can not be cured by herbs.
Who would give a law to lovers? Love is unto itself a higher law.
Boethius, The Consolation of Philosophy
Love is a smoke made with the fume of sighs.
This one is my favorite:
I claim there ain't
As great as Valentine.