Blood was shed through the bruises that Jesus received; He was bruised for our iniquities (bend in our nature towards sin). Bruises last a long time and go very deep. Jesus said "not only will i forgive what they've done on the outside, but I'm going to give them power on the inside so they can walk in total victory." He shed blood from the inside out as well as on the inside, to change the nature of that which causes hurt or suffering. 2 Corinthians 5:21 "For He made Him who knew no sin to be sin for us, that we might become the righteousness of God in Christ."