Because of the new covenant between Christ and God on behalf of mankind, God had not only forgiven our sins but had also imposed a form of “Alzheimer’s” on Himself as it regarded our sins.
“For I will forgive their iniquities and will remember their sins no more.” (Hebrews 8:12)
Because of the blood of Christ, God no longer has any need to remember our sins. Should He have still had such a need after the cross, He would’ve still needed to send Christ again in the body of a human being, naming Him Jesus, and cause Him to die again on a cross.
As the writer to the Hebrews recalled the testimony,
“First he [Christ Jesus] said, “Sacrifices and offerings, burnt offerings and sin offerings you did not desire, nor were you pleased with them”—though they were offered in accordance with the law. Then he said, “Here I am, I have come to do your will.” He sets aside the first to establish the second. And by that will, we have been made holy through the sacrifice of the body of Jesus Christ once for all.” (Hebrews 10:8-10)
Once for all.
Jesus is the well of the living water, the Holy Spirit. 