Read Hebrews 7:23-28
23 There is another difference: there were many of those other priests, because they died and could not continue their work. 24But Jesus lives on for ever, and his work as priest does not pass on to someone else. 25And so he is able, now and always, to save those who come to God through him, because he lives for ever to plead with God for them.
26 Jesus, then, is the High Priest that meets our needs. He is holy; he has no fault or sin in him; he has been set apart from sinners and raised above the heavens. 27He is not like other high priests; he does not need to offer sacrifices every day for his own sins first and then for the sins of the people. He offered one sacrifice, once and for all, when he offered himself. 28The Law of Moses appoints men who are imperfect to be high priests; but God’s promise made with the vow, which came later than the Law, appoints the Son, who has been made perfect for ever.
Jesus, the perfect priest - offers a sacrifice that doesn't just symbolically deal with our sin and our brokenness; but really deals with our sin and our brokenness.
This is a mystery that is hard to understand.
But the truth is simply - our sins can be forgiven; our hearts can be changed.
I don't fully understand your grace; give me the courage to accept it.