I hope, said the third, that your wanderings in lonely places do not mean that you have any of the romantic virus still in your blood. His name was M… - C. S. Lewis

The promise, made when I am in love and because I am in love, to be true to the beloved as long as I live, commits me to being true even if I cease to be in love. A promise must be about things that I can do, about actions: no one can promise to go on feeling in a certain way. He might as well promise to never have a headache or always to feel hungry.

"I think you've seen Aslan," said Edmund.
"Aslan!" said Eustace. "I've heard that name mentioned several times since we joined the Dawn Treader. And I felt - I don't know what - I hated it. But I was hating everything then. And by the way, I'd like to apologise. I'm afraid I've been pretty beastly."
"That's all right," said Edmund. "Between ourselves, you haven't been as bad as I was on my first trip to Narnia. You were only an ass, but I was a traitor."
"Well, don't tell me about it, then," said Eustace. "But who is Aslan? Do you know him?"
"Well - he knows me," said Edmund. "He is the great Lion, the son of the Emperor-beyond-the-Sea, who saved me and saved Narnia. We've all seen him. Lucy sees him most often. And it may be Aslan's country we are sailing to."

Friendship arises out of mere companionship when two or more of the companions discover that they have in common some insight or interest or even taste which the others do not share and which, till that moment, each believed to be his own unique treasure (or burden). The typical expression of opening Friendship would be something like, "What? You too? I thought I was the only one."