-B/c Jesus felt he had borne the penalty for the evils of mankind, he declared his mission as accomplished. Jesus'  to sacrifice himself for others: "The Son of Man came not to be served, but to serve, and to give his life as a ransom for many."  Matthew 20:28

-Because all of the evils of mankind are placed on Jesus. This spiritual separation is the heaviest sacrifice which Jesus pays of behalf of mankind, so that mankand does not need to suffer spiritual separation from God.