Paul’s command is to be angry (from orgizo), with the qualification and yet do not sin. In this statement, he may be legitimating righteous indignation, anger at evil, at that which is done against the Person of the Lord and against His will and purpose. It is the anger of the Lord’s people who hate evil (Ps. 69:9). It is the anger that abhors injustice, immorality, and ungodliness of every sort. It is the anger of which the great English preacher E W. Robertson wrote in one of his letters. When he once met a certain man who was trying to lure a young girl into prostitution, he became so angry that he bit his lip until it bled. Jesus expressed righteous anger at the hard-heartedness of the Pharisees who resented His healing the man with the withered hand on the Sabbath (Mark 3:5). Although the word itself is not used in the gospel accounts of the events, it was no doubt that kind of anger that caused Jesus to drive the moneychangers out of the Temple (Matt. 21:12; John 2:15). Jesus was always angered when the Father was maligned or when others were mistreated, but He was never selfishly angry at what was done against Him. That is the measure of righteous anger.....John MacArthur Psalm 69:9 King James Version 9 For the zeal of thine house hath eaten me up; and the reproaches of them that reproached thee are fallen upon me.