長阿含經 9.p129

9.p129

“There are another six things, which are six spheres of escape: [1] Suppose a monk says, ‘I’d cultivate kindness, but then I become angry.’ The other monks say, ‘Don’t say that! Don’t misrepresent the Tathāgata. The Tathāgata doesn’t say, “I’d like to cultivate the liberation of kindness, but then notions of anger arise.” That’s impossible. The Buddha says, “Once anger is gone, then one becomes kind afterward.”’