"Sometimes I’ll get a call or email from someone five years after the last contact and I’ll think, oh right, I hated that person. But they would never have known, of course. Let’s see if I still hate them. Very often I find that I don’t. Or that I hated them for a dumb reason. Or that they were having a bad day."
And I realized, reading this, that sometimes you meet someone and they are having a very bad year -- or a string of bad years. They might not know how to stop the bad years. So those kind of people you have to be especially kind to, as they enter and exit though your life. Because we are all visitors.