359. You should train yourselves like this, thinking: “We will be contented with no matter what robes, food, shelter or medicine we get. We will be contented with what we get and do nothing unseemly in order to get such things. If we are not able to get robes, food and so on, we will not be perturbed, and if we do get them we will use them without clinging and infatuation, doing no wrong in order to get them, seeing the danger in them and being wise to escaping from it.” This is how you should train yourselves.
Samyutta Nikaya II.195
Cattāri Brahmavihārā 
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