God uses the Blood of Jesus to cleanse our conscience as well as to Atone for our sins.
NEVERTHELESS, the Blood never cleans our old man or natural life.
Our old man is condemned to death.
It cannot be cleansed, for it is too rotten, vile and hopeless.
If a thing can still be patched or mended, built up or strengthened, we will do it.
Not until it gets to the state of being totally hopeless will we throw it away and get a new one.
Our old man with its heart and natural life is beyond repair, patching up or mending.
And hence, God simply discards it and replaces it with a new man with a new heart and His own Life.
Jesus Christ INSTEAD of me.