If Jesus is the Word of God made flesh, then His blood must be divine. Since the blood that ran through His veins was divine, it therefore implies that it has spiritual efficacy. This spiritual efficacy transcends the physical. It was the blood of Jesus that washed our sins away and this is what water baptism signifies. When we were dipped into that water, we were washed physically to represent what actually happened in the spiritual realm to our spirits. This is the purging of our conscience by the blood of Jesus.
What do I mean by conscience? Your conscience is the voice of your human spirit. So you see why the conscience of a Christian is a good guide as opposed to the conscience of the unregenerate man who the blood of Jesus hasn’t washed. When you received Christ into your heart, the blood of Christ washed your spirit clean of all the impurities of this world. Remember what the Lord Jesus instructed Ananias to tell Paul after his conversion on the road to Damascus: “…The God of our fathers hath chosen thee, that thou shouldest know his will, and see that Just One, and shouldest hear the voice of his mouth. For thou shalt be his witness unto all men of what thou hast seen and heard. And now why tarriest thou? arise, and be baptized, and wash away thy sins, calling on the name of the Lord” (ACTS 22:14-16).
The man’s water baptism was only a physical baptism meant to signify the spiritual baptism into the Body of Christ. So you see, we were washed, purified and sanctified by the blood of Christ when we were born again.