In 1958, John Steinbeck wrote a letter to his teenage son, Thomas, who was newly in love with a girl at his boarding school -- and it's chock-full of cute relationship quotes and sage advice.

"Don't worry about losing. If it is right, it happens -- the main thing is not to hurry. Nothing good gets away." --John Steinbeck

Rob Delaney is the co-writer and co-star of the hilarious Amazon series "Catastrophe," which is overflowing with good relationship quotes.

"I can't make you love me, but I can fill my pantry with your favorite snacks." --Rob Delaney

Joan Didion perfectly articulates longing in her memoir "The Year of Magical Thinking."

"A single person is missing for you, and the whole world is empty." --Joan Didion

Oscar Wilde has men -- and women -- pegged in his play "A Woman of No Importance."

"Men always want to be a woman's first love. That is their clumsy vanity. We women have a more subtle instinct about things. What we like is to be a man's last romance." --Oscar Wilde

Richard Burton and Elizabeth Taylor married and divorced each other twice, but he wrote her scores of love letters until the end of his life.

"I might run from her for a thousand years and she is still my baby child. Our love is so furious that we burn each other out." --Richard Burton