Stand in awe, and sin not: commune with your own heart upon your bed, and be still. Selah.
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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 be...
Angry. My soldiers, do not resent this offence too much, kill not the boy; (2 Kings xviii. 5.) or (Haydock) you, my deluded subjects, enter into yourselves. St. Paul (Ephesians iv. 26.) cites this as a moral sentence. (Calmet)
It is more difficult to moderate anger than to deny access to it entirely. (St. Francis de Sales) (Haydock)
Beds. Repent for the most secret evil thoughts, before you fall asleep. (Worthington)