Whoever always bears in his soul a living faith in the tri-hypostatic God, according to the teaching of the word of God, and lives by faith, keeping God’s commandments, truly walks in the light of God. The light of God’s majesty, beheld by the eyes of faith, enlightens the believer with knowledge of the truth. It warms his heart with holy love and makes his life fruitful in good works. But whoever does not see this light is dark, cold, and barren in good action.
Whoever walks in God’s light, keeping God’s commandments, has communion in this light with the apostles and with all the saints, both living on earth and dwelling in heaven. For one and the same Spirit of God communicates spiritual life to all the saints, to men and angels.
“And the blood of Jesus Christ His Son cleanses us from every sin.” Having said, “if we walk in the light,” then “we have communion with one another,” the holy Theologian turns his gaze to the great and boundless gift of divine love for mankind. For this gift we must eternally thank God. By its power alone can we walk in God’s light and have communion with the apostles and all the saints. He turns his gaze to the redemption of all men by the sufferings and death on the Cross of the Son of God, Jesus Christ.
The apostle says this: if we, enlightened by faith in God, live piously and in holiness, imitating the perfections of the all-holy God, then we have communion with one another and are closely united among ourselves. For the Son of God, Jesus Christ, suffered and died for the sins of the whole world. By His death He reconciled us with God. The power of His merits, or the price of His blood, covers our sins. His blood cleanses us from every sin and unites all, as redeemed by the one blood of the Lord and Savior, into one society or one body of His.
“We have communion with one another, and the blood of Jesus Christ cleanses us from every sin.” Thus all believers in Christ, saved by this faith, are closely bound together, because all have one source of salvation, namely the blood of Jesus Christ, or His redemptive merits. Only by the price of His suffering and death are we freed from ancestral sin and from condemnation for sin. We are cleansed from all our sins committed before regeneration in holy baptism. We also hope to receive forgiveness of those sins to which, through the weakness of our nature corrupted by sin, we are subject after baptism as long as we bear this corruptible body.
And who can say that he does not participate in this great gift of God’s mercy? Who has the right to think that he has no need of this cleansing blood of the Lord and Redeemer?