How can I clear my conscience?

TL;DR:

A clear conscience comes only through faith in Jesus, whose sacrifice atones for our sins and restores our relationship with God. Trying to clear our conscience on our own will always fail, but trusting in Jesus brings forgiveness, freedom, and ongoing fellowship with God we need for a clear conscience.

what does the bible say?

A clear conscience cannot be achieved through human effort or good deeds alone because all people inherit a sinful nature from Adam and Eve, separating them from God (Ephesians 2:1-3). God provided a way to restore that relationship through the sacrificial death of Jesus Christ, whose perfect life and atoning death cover our sins and remove guilt (1 Peter 1:18-19; John 3:16-17). When we place our faith in Jesus, we are forgiven, reconciled to God, and given the ability to pursue holiness and righteousness (Romans 6:18). Our faith is confirmed not by rituals or works, but by the way we live in obedience to God and continue to confess our sins (1 John 1:9; Matthew 6:33). A clear conscience is the result of trusting in Jesus’ sacrifice, growing in fellowship with Him, and relying on His guidance and presence (Hebrews 10:19-22). Though we will still fall short, God’s faithfulness ensures forgiveness and ongoing cleansing from sin, giving freedom from guilt and shame. Ultimately, true freedom and peace of conscience come only through Jesus, whose death and resurrection allow us to live in a restored relationship with God (John 8:36).

from the old testament

Adam and Eve, the first humans, sinned against God when they disobeyed Him (Genesis 3:6). They were created to have a relationship with God and each other. So were we. But their sin got in the way, and so does ours.
The conscience is what God gave us so we know right from wrong (Psalm 51:6). When we say we want a clear conscience, we want purity, holiness, and absolution from the mistakes, or sins, we have made.

from the new testament

Adam and Eve passed down a sinful nature to all their descendants. We all disobey God and also experience separation from Him and from one another. The Bible says that we are "dead" in our sins (Ephesians 2:1-3). We can’t save ourselves.
But God makes a way for us to be in a right relationship with Him through faith in Christ (Ephesians 2:4-5).
Though men and women have devised various ways to be right before God, none work except the way God intends: faith in Christ (John 14:6).
God made the way for us to be right before Him and to have clear consciences through the death of a perfect and innocent Being (1 Peter 1:18-19; see Exodus 12:5 and Leviticus 9:3). That perfect sacrifice was His own Son, Jesus Christ, the Messiah: "For God so loved the world, that he gave his only Son, that whoever believes in him should not perish but have eternal life. For God did not send his Son into the world to condemn the world, but in order that the world might be saved through him" John 3:16-17).
Jesus went to the cross willingly, taking all of our sins with Him to atone for them (1 Peter 2:24). His death was the result of all of God's wrath against us and our sin ( John 3:36).
Hebrews 10:19-22 states, "Therefore, brothers, since we have confidence to enter the holy places by the blood of Jesus, by the new and living way that he opened for us through the curtain, that is, through his flesh, and since we have a great priest over the house of God, let us draw near with a true heart in full assurance of faith, with our hearts sprinkled clean from an evil conscience and our bodies washed with pure water."
When we try to create a clear conscience ourselves, we fail. We cannot become pure, nor remain pure, based on willpower, trying harder, or being good. Only God will separate us from our sin (Hebrews 8:12).

implications for today

Recognizing who Jesus is and His sacrificial atonement for our sins helps us pursue righteousness, purity, and a clear conscience (Romans 6:18). Of course, we will continue to fall short of the perfect fellowship God desires for us, but God took care of that, too: "If we confess our sins, he is faithful and just to forgive us our sins and to cleanse us from all unrighteousness" (1 John 1:9).

Our clear consciences come when we are in a right relationship with God. We must have faith that Jesus' sacrifice was for our own punishment and that He defeated even death by His resurrection from the dead. This puts us in a position to be in relationship with God. Then we grow in that fellowship with God—keeping our consciences clear, choosing to live for Him, seeking the things of God rather than of the world (Matthew 6:33), and continuing to confess our sins when we fall short, trusting that He is always faithful to forgive. A clear conscience is freedom. Jesus said, "So if the Son sets you free, you will be free indeed" (John 8:36).

understand

A clear conscience comes only through faith in Jesus, whose sacrifice atones for our sins.
Our consciences are tainted by sin.
Faith in Jesus puts us in a right relationship with God, which gives us a clear conscience.

reflect

How do you rely on Jesus’ sacrifice rather than your own efforts to maintain a clear conscience?
Where in your life do you need to confess sins and trust God’s forgiveness more fully?
How can you grow in your relationship with God to experience ongoing peace when your conscience is not clear?

engage

How do we encourage each other to rely on Jesus’ sacrifice instead of our own attempts to earn forgiveness?
What is our role in pursuing holiness and maintaining a clear conscience, and what is God’s?
How can we practically remind one another that faith, confession, and obedience—not personal effort—sustain a clear conscience?