John Piper preached a message at the T4G that I attended last week entitled, Did Jesus Preach Paul’s Gospel? I found the message extremely helpful in seeing how Jesus taught justification. The argument has been made that Jesus had a certain message and that Paul “embellished” on it to a point that Jesus never intended by adding the idea of being justified by faith alone. Therefore, this issue strikes at the very heart of the Gospel and the authority of the Bible in general.
Dr. Piper argued from Luke 18:9-14 that Jesus taught the imputation of his righteousness comes by grace alone through faith alone.