Obviously, it is only on the basis of calmness, tolerance and mutual understanding that problems or conflicts can be effectively resolved, especially worldly conflicts. On the contrary, if everyone stands on his own ground and considers only his own interests, there will never be an absolutely fair result. Or even if the external problems are resolved, if one still cannot let go of the anger in one’s heart, then the suffering will not just disappear.So, on this point, we can ask ourselves, ultimately where does suffering come from?