201. I have learned two things: not to be content with good states one has already developed, and not to give up trying. Without giving up, I keep trying and think: “Gladly would I have my skin, bones and sinews wither and my flesh and blood dry up, if only I can struggle until I win that which can be won by human effort.” It was by earnest endeavour that I won enlightenment and the highest freedom from bonds.
Anguttara Nikaya I.49
Cattāri Brahmavihārā 
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