Eph. 4:23-28
Brethren: Be ye renewed in the spirit of your mind, and put on the new man, who according to God is created in justice and holiness of truth. Wherefore, putting away lying, speak ye the truth every man with his neighbour, for we are members one of another. Be angry, and sin not. Let not the sun go down upon your anger. Give not place to the devil. He that stole, let him now steal no more: but rather let him labour, working with his hands the thing which is good, that he may have something to give to him that suffereth need.
Haydock
Verse 26. Be angry, and sin not, as it is said Ps. iv. 5. Anger, as a passion of the mind, may proceed from a good motive and be guided by reason; as our Saviour, Christ, (Mark iii. 5.) is said to have looked about at the Jews with anger, i.e. with a zeal against their blindness and malice. — Let not the sun go down upon your anger. If moved to anger, return without delay to a calmness of mind and temper. Wi. — Be angry when reason or necessity compels you; but even then, so restrain your anger that you neither offend God nor scandalize your neighbour. Moreover, lay it aside as soon as you are able, so that the sun go not down upon your anger. Jansenius.