Source: From the Notebooks of Dr. Brain (2007), Chapter 4 “Iconoclastic means “I Can!”” (p. 106)
“One of the curiosities of anger, of course, is that the more you focus it outward, firing it at the injustices of the world, the more it actually parses your own self-pity and resentment.”
Part 2, Chapter 13, “Of Multitudes” (p. 238).
Jack Glass (2012)
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On his preferred themes in “Deaf poetics: Conversation with Raymond Antrobus" https://poetryinternationalonline.com/conversation-with-raymond-antrobus/ (Poetry International; 2018 Oct 11)

“Resentment and anger are bad for your blood pressure and your digestion.”
As quoted in "Truth and reconciliation" at BBC Focus on Africa (January-March 2000)

Variant: I’ve learned that I must find positive outlets for anger or it will destroy me. There is a certain anger; it reaches such intensity that to express it fully would require homicidal rage — self-destructive, destroy-the-world rage — and its flame burns because the world is so unjust. I have to try to find a way to channel that anger to the positive, and the highest positive is forgiveness.
Source: The Measure of a Man (2000)

“More often than not, anger is actually an indication of weakness rather than of strength.”
“Anger is stupid, and stupidity will kill you more surely than your opponent's blade.”
Source: Dragon Bones