In Jesus' final public teaching in the Gospel of John (10:22-42), the people of Jerusalem tried to pin him down. They wanted him to declare openly who he was. In keeping with his indirect public style, Jesus pointed them to his words and works. He also boldly declared, "I and the Father are one." This statement sent them looking for rocks to stone him, since they thought he was a man who made himself out to be God. They grasped that he claimed identity with God, but they got things exactly backwards. (sermon notes)
Because humans were dead in our sins, the only possible solution was for God to make us alive because of his grace.
After God confirmed his covenant with Israel, and Israel broke it, God graciously renewed it again.
God used the sinful actions of humans to fulfill his will to provide the innocent one to take the place of the guilty.