“Thus you should train yourselves: ‘We will relentlessly exert ourselves, [thinking,] “Gladly would we let the flesh & blood in our bodies dry up, leaving just the skin, tendons, & bones, but if we have not attained what can be reached through human firmness, human persistence, human striving, there will be no relaxing our persistence.”‘ That’s how you should train yourselves.”
Cattāri Brahmavihārā 
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