John Bunyan: The penalty for sin is paid and the reward for perfect righteousness is received through imputation

"Our sins when laid upon Christ were yet personally ours, not his; so his righteousness when put upon us is yet personally his, not ours. What is it, then? Why, 'he was made to be sin for us, who knew no sin; that we might be made the righteousness of God in him,' 2 Cor. 5:21." –John Bunyan