A post by Vanderleun on American Digest today caught my attention. I think it's something we should be aware of, especially as we get older. He's a very good writer.

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THESE DAYS NEW FRIENDS come more rarely and old friends begin to leave more often. Fate, accidents, God’s will, and misunderstandings take them, as they shall take us all, as the years roll on. And as these years roll on the need to acquire light friendships pales before the deeper ones that endure. But some end too soon, far too soon, and their leaving lingers as if the debt you owe to them is the debt of memory; one on which only the interest can be paid, never the principal.