Expressing penitence means feeling sorrow for sin, and imploring the Lord’s forgiveness. We need to receive His Divine Mercy daily to face our human weakness. God assures us that: “whoever conceals their sins does not prosper, but the one who confesses and renounces them finds mercy.” (Proverbs 28: 13). Here is a beautiful Psalm from the Bible to help you on the first step towards forgiveness: repentance.
Of David. A petition.
1 Lord, do not rebuke me in your anger or discipline me in your wrath.
2 Your arrows have pierced me, and your hand has come down on me.
3 Because of your wrath there is no health in my body; there is no soundness in my bones because of my sin.
4 My guilt has overwhelmed me like a burden too heavy to bear.
5 My wounds fester and are loathsome because of my sinful folly.
6 I am bowed down and brought very low; all day long I go about mourning.
7 My back is filled with searing pain; there is no health in my body.
8 I am feeble and utterly crushed; I groan in anguish of heart.
9 All my longings lie open before you, Lord; my sighing is not hidden from you.
10 My heart pounds, my strength fails me; even the light has gone from my eyes.
11 My friends and companions avoid me because of my wounds; my neighbors stay far away.
12 Those who want to kill me set their traps, those who would harm me talk of my ruin; all day long they scheme and lie.
13 I am like the deaf, who cannot hear, like the mute, who cannot speak;
14 I have become like one who does not hear, whose mouth can offer no reply.
15 Lord, I wait for you; you will answer, Lord my God.
16 For I said, “Do not let them gloat or exalt themselves over me when my feet slip.”
17 For I am about to fall, and my pain is ever with me.
18 I confess my iniquity; I am troubled by my sin.
19 Many have become my enemies without cause; those who hate me without reason are numerous.
20 Those who repay my good with evil lodge accusations against me, though I seek only to do what is good.
21 Lord, do not forsake me; do not be far from me, my God.
22 Come quickly to help me, my Lord and my Savior.