Stand in awe, and sin not: commune with your own heart upon your bed, and be still. Selah.
All Commentaries on Psalms 4:4 Go To Psalms 4
Augustine of Hippo
6. "Be ye angry, and sin not" (ver. 4) For the thought occurred, Who is worthy to be heard? or how shall the sinner not cry in vain unto the Lord? Therefore, "Be ye angry," saith he, "and sin not." Which may be taken two ways: either, even if ye be angry, do not sin; that is, even if there arise an emotion in the soul, which now by reason of the punishment of sin is not in our power, at least let not the reason and the mind, which is after God regenerated within, that with the mind we should serve the law of God, although with the flesh we as yet serve the law of sin consent thereunto; or, repent ye, that is, be ye angry with yourselves for your past sins, and henceforth cease to sin. "What you say in your hearts:" there is understood, "say ye:" so that the complete sentence is, "What ye say in your hearts, that say ye;" that is, be ye not the people of whom it is said, "with their lips they honour Me, but their heart is far from Me. In your chambers be ye pricked." This is what has been expressed already "in heart." For this is the chamber, of which our Lord warns us, that we should pray within, with closed doors. But, "be ye pricked," refers either to the pain of repentance, that the soul in punishment should prick itself, that it be not condemned and tormented in God's judgment; or, to arousing, that we should awake to behold the light of Christ, as if pricks were made use of. But some say that not, "be ye pricked," but, "be ye opened," is the better reading; because in the Greek Psalter it is katanughte, which refers to that enlargement of the heart, in order that the shedding abroad of love by the Holy Ghost may be received.