The apostle John is used of God to tell us this good news, “The blood of Jesus Christ His Son cleanseth us from all sin.” If I understand correctly, the tense of this word “cleanseth” is the linear tense which signifies a continual action. This means that the efficacy of Christ's blood in washing away our sins is constant at all times and in all circumstances. It is constant when we are confessing our sins and when we are not. When we are conscious of them or not. His sacrifice was sufficient to make an end of our sins in the sight of God's holy justice forever. Before the court of heaven they are no more. But there is somewhere else that our sin is often a matter to be settled, in our conscience! It is here that we are often found without peace and troubled. It  is only when the Holy Spirit brings this word to our minds and applies  it to our consciences that we can rest and experience the peace of God. It is in this great truth believed that we get relief from the accusing conscience. The blood of Jesus has cleansed us from all sin, is cleansing us from all sin and shall cleanse us from all sin! His blood, not our works. His blood, the blood of the Lamb of God. It is the blood of Jesus Christ who is God manifest in the flesh. It is sinless, God-satisfying blood. It is the precious blood that cleanseth us from ALL sin!