Pope Shenouda III
When the rich young man asked the Lord: "Good teacher, what good thing shall I do that I may have eternal life?", why did the Lord reply: "Why do you call Me good? No one is good but One, that is, God" (Matt. 19:16,17)? The reply:
The Jews were accustomed to calling their teachers good teacher'. So the Lord Jesus Christ wanted to ask the young man: "Are you giving Me this title as a routine custom, as you would do for other teachers? If so, know that no one is good but One, that is, God. And do you believe that I am this God?"
The Lord Jesus Christ did not say that He was not good but rather, on another occasion, He said: "I am the, good shepherd" (Jn. 10: 11), and He also said: "Which of you convicts Me of sin?" (Jn. 8:46)