The Hebrew priest's of old, on the Day of Atonement, would offer a blood sacrifice for the sins of the people.

All Israel was required to come to the temple 10 days prior to Yom Kippur. At this time, they would repent to each other and to the Lord. 

Each year the priest was required to offer the blood sacrifice, year after year.

The sins were breaking the Law. The blood sacrifice was offered in place of the people. For the Lord requires blood payment for breaking His Law.

When Christ became our atonement, He offered His blood, in our place. Because He was God and man, perfectly keeping the Law, thus dying for sins He never committed, the Father forgave all sin (breaking the Law).

When we pick the Law back up, what we must remember is that the Law requires blood payment. So if you pick up the Law, and break one of them, then another blood sacrifice will need to be paid. 

When we receive the Holy Spirit, He puts a new heart within us,  one that seeks His presence. We have been sanctified (“to make holy or sacred”) by the blood of Christ, through faith in His sacrifice, and the Power of the Holy Spirit. Without being sanctified, we would not be permitted to even speak with God. Nor would He be able to dwell within us. Christ is able to dwell within us, because we have been sanctified, and our hearts are clean, when we repent. Repentance means having a broken and contrite heart.

Christ sees our inner most being, He sees our heart, when we continue in sin, our hearts become calloused, and no longer broken. We turn from His presence.

Christ said we must worship the Father in the spirit, in faith. When we attempt to keep the Law, we are keeping the Law in the flesh. But grace and faith are spiritual.

In order to keep the Law, then a blood sacrifice is needed if even the smallest on is ever broken.

 The Law has been fulfilled, the spiritual punishment for breaking the Law has been paid.

We have been FORGIVEN!

Because of sin, we still suffer physically.

But when we repent ( to think differently or afterwards, that is, reconsider (morally to feel compunction): - repent.) our heart if clear before the Lord.