All under the power of sin:
“Who can say, "I have cleansed my heart, I am pure from my sin"?” (Proverbs 20:9)
“Indeed, there is not a righteous man on earth who continually does good and who never sins.” (Ecclesiastes 7:20)
“"How then can a man be just with God? Or how can he be clean who is born of woman? "If even the moon has no brightness And the stars are not pure in His sight, How much less man, that maggot, And the son of man, that worm!"” (Job 25:4-6)
“"Is there any number to His troops? And upon whom does His light not rise? "How then can a man be just with God? Or how can he be clean who is born of woman? "If even the moon has no brightness And the stars are not pure in His sight, How much less man, that maggot, And the son of man, that worm!"” (Job 25:3-6)
“If You, LORD, should mark iniquities, O Lord, who could stand? But there is forgiveness with You, That You may be feared.” (Psalms 130:3-4)
“And do not enter into judgment with Your servant, For in Your sight no man living is righteous.” (Psalms 143:2)
Self deception:
“”Also on your skirts is found The lifeblood of the innocent poor; You did not find them breaking in. But in spite of all these things, Yet you said, 'I am innocent; Surely His anger is turned away from me.' Behold, I will enter into judgment with you Because you say, 'I have not sinned.'” (Jeremiah 2:34-35)
“"How can you say, 'I am not defiled, I have not gone after the Baals'? Look at your way in the valley! Know what you have done! You are a swift young camel entangling her ways, A wild donkey accustomed to the wilderness, That sniffs the wind in her passion. In the time of her heat who can turn her away? All who seek her will not become weary; In her month they will find her.” (Jeremiah 2:23-24)
“"Behold, you are trusting in deceptive words to no avail. "Will you steal, murder, and commit adultery and swear falsely, and offer sacrifices to Baal and walk after other gods that you have not known, then come and stand before Me in this house, which is called by My name, and say, 'We are delivered!'—that you may do all these abominations?” (Jeremiah 7:8-10)
“If we say that we have fellowship with Him and yet walk in the darkness, we lie and do not practice the truth;” (1 John 1:6)
“If we say that we have no sin, we are deceiving ourselves and the truth is not in us.” (1 John 1:8)
“If we say that we have not sinned, we make Him a liar and His word is not in us.” (1 John 1:10)
“The one who says, "I have come to know Him," and does not keep His commandments, is a liar, and the truth is not in him;” (1 John 2:4)
“The one who says he is in the Light and yet hates his brother is in the darkness until now.” (1 John 2:9)
“But if you have bitter jealousy and selfish ambition in your heart, do not be arrogant and so lie against the truth.” (James 3:14)
“Transgression speaks to the ungodly within his heart; There is no fear of God before his eyes. For it flatters him in his own eyes Concerning the discovery of his iniquity and the hatred of it. The words of his mouth are wickedness and deceit; He has ceased to be wise and to do good. He plans wickedness upon his bed; He sets himself on a path that is not good; He does not despise evil.” (Psalms 36:1-4)
“Samuel came to Saul, and Saul said to him, "Blessed are you of the LORD! I have carried out the command of the LORD." But Samuel said, "What then is this bleating of the sheep in my ears, and the lowing of the oxen which I hear?" Saul said, "They have brought them from the Amalekites, for the people spared the best of the sheep and oxen, to sacrifice to the LORD your God; but the rest we have utterly destroyed." Then Samuel said to Saul, "Wait, and let me tell you what the LORD said to me last night." And he said to him, "Speak!" Samuel said, "Is it not true, though you were little in your own eyes, you were made the head of the tribes of Israel? And the LORD anointed you king over Israel, and the LORD sent you on a mission, and said, 'Go and utterly destroy the sinners, the Amalekites, and fight against them until they are exterminated.' "Why then did you not obey the voice of the LORD, but rushed upon the spoil and did what was evil in the sight of the LORD?" Then Saul said to Samuel, "I did obey the voice of the LORD, and went on the mission on which the LORD sent me, and have brought back Agag the king of Amalek, and have utterly destroyed the Amalekites. "But the people took some of the spoil, sheep and oxen, the choicest of the things devoted to destruction, to sacrifice to the LORD your God at Gilgal."” (1 Samuel 15:13-21)
“The man said, "The woman whom You gave to be with me, she gave me from the tree, and I ate."” (Genesis 3:12)
Results of not confessing:
“"Have I covered my transgressions like Adam, By hiding my iniquity in my bosom, Because I feared the great multitude, And the contempt of families terrified me, And kept silent and did not go out of doors?” (Job 31:33-34)
“O LORD, rebuke me not in Your wrath, And chasten me not in Your burning anger. For Your arrows have sunk deep into me, And Your hand has pressed down on me. There is no soundness in my flesh because of Your indignation; There is no health in my bones because of my sin. For my iniquities are gone over my head; As a heavy burden they weigh too much for me. My wounds grow foul and fester Because of my folly. I am bent over and greatly bowed down; I go mourning all day long. For my loins are filled with burning, And there is no soundness in my flesh. I am benumbed and badly crushed; I groan because of the agitation of my heart. Lord, all my desire is before You; And my sighing is not hidden from You. My heart throbs, my strength fails me; And the light of my eyes, even that has gone from me. My loved ones and my friends stand aloof from my plague; And my kinsmen stand afar off. Those who seek my life lay snares for me; And those who seek to injure me have threatened destruction, And they devise treachery all day long. But I, like a deaf man, do not hear; And I am like a mute man who does not open his mouth. Yes, I am like a man who does not hear, And in whose mouth are no arguments. For I hope in You, O LORD; You will answer, O Lord my God. For I said, "May they not rejoice over me, Who, when my foot slips, would magnify themselves against me." For I am ready to fall, And my sorrow is continually before me. For I confess my iniquity; I am full of anxiety because of my sin. But my enemies are vigorous and strong, And many are those who hate me wrongfully. And those who repay evil for good, They oppose me, because I follow what is good. Do not forsake me, O LORD; O my God, do not be far from me! Make haste to help me, O Lord, my salvation!” (Psalms 38:1-22)
“When I kept silent about my sin, my body wasted away Through my groaning all day long. For day and night Your hand was heavy upon me; My vitality was drained away as with the fever heat of summer. Selah.” (Psalms 32:3-4)
“Be gracious to me, O LORD, for I am in distress; My eye is wasted away from grief, my soul and my body also. For my life is spent with sorrow And my years with sighing; My strength has failed because of my iniquity, And my body has wasted away.” (Psalms 31:9-10)
“Jesus said to them, "If you were blind, you would have no sin; but since you say, 'We see,' your sin remains.” (John 9:41)
Confess!
“'Only acknowledge your iniquity, That you have transgressed against the LORD your God And have scattered your favors to the strangers under every green tree, And you have not obeyed My voice,' declares the LORD. 'Return, O faithless sons,' declares the LORD; 'For I am a master to you, And I will take you one from a city and two from a family, And I will bring you to Zion.'” (Jeremiah 3:13-14)
“For everyone who does evil hates the Light, and does not come to the Light for fear that his deeds will be exposed. But he who practices the truth comes to the Light, so that his deeds may be manifested as having been wrought in God."” (John 3:20-21)
Forgiveness:
“If we confess our sins, He is faithful and righteous to forgive us our sins and to cleanse us from all unrighteousness.” (1 John 1:9)
“How blessed is he whose transgression is forgiven, Whose sin is covered! How blessed is the man to whom the LORD does not impute iniquity, And in whose spirit there is no deceit!” (Psalms 32:1-2)
“I acknowledged my sin to You, And my iniquity I did not hide; I said, "I will confess my transgressions to the LORD"; And You forgave the guilt of my sin. Selah.” (Psalms 32:5)
“Peter said to them, "Repent, and each of you be baptized in the name of Jesus Christ for the forgiveness of your sins; and you will receive the gift of the Holy Spirit.” (Acts 2:38)
The unforgivable sin:
“"It shall be when he hears the words of this curse, that he will boast, saying, 'I have peace though I walk in the stubbornness of my heart in order to destroy the watered land with the dry.' "The LORD shall never be willing to forgive him, but rather the anger of the LORD and His jealousy will burn against that man, and every curse which is written in this book will rest on him, and the LORD will blot out his name from under heaven.” (Deuteronomy 29:19-20)
“Therefore in that day the Lord GOD of hosts called you to weeping, to wailing, To shaving the head and to wearing sackcloth. Instead, there is gaiety and gladness, Killing of cattle and slaughtering of sheep, Eating of meat and drinking of wine: "Let us eat and drink, for tomorrow we may die." But the LORD of hosts revealed Himself to me, "Surely this iniquity shall not be forgiven you Until you die," says the Lord GOD of hosts.” (Isaiah 22:12-14)
“Then she conceived again and gave birth to a daughter. And the LORD said to him, "Name her Lo-ruhamah, for I will no longer have compassion on the house of Israel, that I would ever forgive them.” (Hosea 1:6)
“Hear this, you who trample the needy, to do away with the humble of the land, saying, "When will the new moon be over, So that we may sell grain, And the sabbath, that we may open the wheat market, To make the bushel smaller and the shekel bigger, And to cheat with dishonest scales, So as to buy the helpless for money And the needy for a pair of sandals, And that we may sell the refuse of the wheat?" The LORD has sworn by the pride of Jacob, "Indeed, I will never forget any of their deeds.” (Amos 8:4-7)
“"For I have told him that I am about to judge his house forever for the iniquity which he knew, because his sons brought a curse on themselves and he did not rebuke them. "Therefore I have sworn to the house of Eli that the iniquity of Eli's house shall not be atoned for by sacrifice or offering forever."” (1 Samuel 3:13-14)
“For if we go on sinning willfully after receiving the knowledge of the truth, there no longer remains a sacrifice for sins, but a terrifying expectation of judgment and THE FURY OF A FIRE WHICH WILL CONSUME THE ADVERSARIES. Anyone who has set aside the Law of Moses dies without mercy on the testimony of two or three witnesses. How much severer punishment do you think he will deserve who has trampled under foot the Son of God, and has regarded as unclean the blood of the covenant by which he was sanctified, and has insulted the Spirit of grace? For we know Him who said, "VENGEANCE IS MINE, I WILL REPAY." And again, "THE LORD WILL JUDGE HIS PEOPLE." It is a terrifying thing to fall into the hands of the living God.” (Hebrews 10:26-31)
“"Therefore I say to you, any sin and blasphemy shall be forgiven people, but blasphemy against the Spirit shall not be forgiven. "Whoever speaks a word against the Son of Man, it shall be forgiven him; but whoever speaks against the Holy Spirit, it shall not be forgiven him, either in this age or in the age to come.” (Matthew 12:31-32)
Not even prayer can atone for such sins:
“If anyone sees his brother committing a sin not leading to death, he shall ask and God will for him give life to those who commit sin not leading to death. There is a sin leading to death; I do not say that he should make request for this.” (1 John 5:16)
“"As for you, do not pray for this people, and do not lift up cry or prayer for them, and do not intercede with Me; for I do not hear you.” (Jeremiah 7:16)
“"Therefore do not pray for this people, nor lift up a cry or prayer for them; for I will not listen when they call to Me because of their disaster.” (Jeremiah 11:14)
“So the LORD said to me, "Do not pray for the welfare of this people. "When they fast, I am not going to listen to their cry; and when they offer burnt offering and grain offering, I am not going to accept them. Rather I am going to make an end of them by the sword, famine and pestilence."” (Jeremiah 14:11-12)