Writer and philosopher Iris Murdoch was married to John Bayley for 43 years, so she gets it.

"Love is the extremely difficult realization that something other than oneself is real." --Iris Murdoch

If you've read "Wuthering Heights," you know that Heathcliff gets all the best (i.e., most romantic) lines.

"If you ever looked at me once with what I know is in you, I would be your slave." --Emily Brontë

The late Carrie Fisher spilled about her intense marriage to musician Paul Simon in "Wishful Drinking" with this sentiment, one of many good relationship quotes in her autobiographical book.

"Paul and I had the secret handshake of shared sensibility." --Carrie Fisher

Cute couple Kevin Bacon and Kyra Sedgwick are famously still hot for each other.

"Keep the fights clean and the sex dirty." --Kevin Bacon

Sylvia Plath's private journal entries about her husband, Ted Hughes, are characteristically thoughtful and make for reflective, good relationship quotes.

"What is only pieces, doled out here and there to this boy and that boy, that made me like pieces of them, is all jammed together in my husband." --Sylvia Plath