W.B. Yeats: You're young Cassidy, and that makes your passion effortless and artless. Think towards the day when you are old and the passion is painful and remorseless. What you have now has given you pity. What you must one day find will give you compassion. Age, the winter days, make the chill of the frost as compelling as the heat of the sun. Lovers look towards the time of day when the sun goes down. But give a thought to the time, when as an old man, you'll be surprised to see the sun come up. The warmth of your girl's body inspires you now, Cassidy. There will be a time when you must be inspired by the Artic waste. Prepare for that.