Ephesians 4:26

Observe his wisdom. He both speaks to prevent our sinning, and, if we do not listen, still does not forsake us; for his fatherly compassion does not desert him. For just as the physician prescribes to the sick what he must do, and if he does not submit to it, still does not treat him with contempt, but proceeding to add what advice he can by persuasion, again goes on with the cure; so also does Paul. For he indeed who does otherwise, aims only at reputation, and is annoyed at being disregarded; whereas he who on all occasions aims at the recovery of the patient, has this single object in view, how he may restore the patient, and raise him up again. This then is what Paul is doing. He has said, "Lie not." Yet if ever lying should produce anger, he goes on again to cure this also. For what saith he? "Be ye angry, and sin not." It were good indeed never to be angry. Yet if ever any one should fall into passion, still let him not fall into so great a degree. "For let not the sun," saith he, "go down upon your wrath." Wouldest thou have thy fill of anger? One hour, or two, or three, is enough for thee; let not the sun depart, and leave you both at enmity. It was of God's goodness that he rose: let him not depart, having shone on unworthy men. For if the Lord of His great goodness sent him, and hath Himself forgiven thee thy sins, and yet thou forgivest not thy neighbor, look, how great an evil is this! And there is yet another besides this. The blessed Paul dreads the night, lest overtaking in solitude him that was wronged, still burning with anger, it should again kindle up the fire. For as long as there are many things in the daytime to banish it, thou art free to indulge it; but as soon as ever the evening comes on, be reconciled, extinguish the evil whilst it is yet fresh; for should night overtake it, the morrow will not avail to extinguish the further evil which will have been collected in the night. Nay, even though thou shouldest cut off the greater portion, and yet not be able to cut off the whole, it will again supply from what is left for the following night, to make the blaze more violent. And just as, should the sun be unable by the heat of the day to soften and disperse that part of the air which has been during the night condensed into cloud, it affords material for a tempest, night overtaking the remainder, and feeding it again with fresh vapors: so also is it in the case of anger.