William Shakespeare

They do not love that do not show their love.

The love of heaven makes one heavenly.

Love is not love that alters when it alteration finds.

Love is too young to know what conscience is.

Speak low, if you speak love.

Who could refrain that had a heart to love and in that heart courage to make love known?

Love sought is good, but given unsought, is better.

Love to faults is always blind, always is to joy inclined. Lawless, winged, and unconfined, and breaks all chains from every mind.

The course of true love never did run smooth.