Frederick Buechner on Anger

In preparing for this Sunday's sermon on Jonah 4, where the prophet Jonah throws a massive temper tantrum over God's mercy toward wicked Ninevah, I came across this quote by Frederick Buechner: 

"Of the Seven Deadly Sins, anger is possibly the most fun. To lick your wounds, to smack your lips over grievances long past, to roll over your tongue the prospect of bitter conversations still to come, to savor to the last toothsome morsel both the pain you are given and the pain you are giving back- in many ways it is a feast fit for a king. The chief drawback is that what you are wolfing down is yourself. The skeleton at the feast is you" (Wishful Thinking, p. 2).