…we also joy in God through our Lord Jesus Christ, by whom we have now received the atonement. – Romans 5:11

The Power of Jesus to cleanse from sin must lie, first, in the greatness of His person. It is not conceivable that the sufferings of a mere man, however holy or great he might have been, could have made atonement for the sins of the whole multitude of the Lord’s chosen people. It was because Jesus Christ was one of the persons in the Divine Trinity, it was because the Son of Mary was none other than the Son of God, it was because He who lived, and laboured, and suffered, and died and was the great Creator, without whom was not anything made that was made, that His blood has such efficacy that it can wash the blackest sinner so clean that they are “whiter than snow.” The death of the best man who ever lived could not make an atonement even for his own sins, much less could it atone for the guilt of others; but when God Himself “took upon Him the form of a servant, and was made in the likeness of men,” and “humbled Himself, and became obedient unto death, even the death of the cross,” no limit can be set to the value of the atonement that He made. We hold most firmly the doctrine of particular redemption, that Christ loved His Church, and gave Himself for it; but we do not hold the doctrine of the limited value of His precious blood. There can be no limit to Deity, there must be infinite value in the atonement which was offered by Him who is divine. The only limit of the atonement is in its design, and that design was that Christ should give eternal life to as many as the Father has given Him; but in itself the atonement is sufficient for the salvation of the whose world, and if the entire race of mankind could be brought to believe in Jesus, there is enough efficacy in His precious blood to cleanse everyone born of woman from every sin that all of them have ever committed.

The Lord knows exactly what your sin is, therefore do not try to use polite terms about it. Tell Him what it is, that He may know that you know what it is. ~ C.H. Spurgeon

https://www.blueletterbible.org/Comm/spurgeon_charles/sermons/3278.cfm