Garrison Keillor, quoting you:

I could have done that. I could have done that while doing all the other things that I do. Why didn't I?

Theodore Dalrymple:

Resentment never lets you down, because it is powerful in its capacity to stimulate the imagination.

Resentment allows you to dream on about all you would have achieved if things had been different (better, of course, for no one dreams of how little they would have achieved had things been worse).

But the real reward of resentment is that is changes the polarities of success and failure, or at least of the worth of success and failure. The fact that I am a failure in a certain regard shows that I am not only more sensitive than a vulgar success in that same regard, but really I am morally superior to him. To become a success, he has not had to contend with all that I have had to contend with to become a failure. Really, I am better than he, if only the world would recognize it.

Decius:

If the key is weak enough and the resentment high enough, you might fall victim to a public cracking effort.

Dr. Nanochick:

Liking Canadians is a way to identify with what you like about American culture without having to sacrifice your resentment.

Paul Krugman:

The main reason Mr. Obama finds himself in this situation is that two years ago he was not, in fact, prepared to deal with the world as he was going to find it. And it seems as if he still isn't.

Jerry Weinberger:

So convenient a thing it is to be a reasonable creature, since it enables one to find a reason for every thing one has a mind to do.