Mark 10:18
Why do you call me good? Jesus answered. No one is good — except God alone — the response to the good teacher title reorients the conversation: the category of goodness belongs to God alone. Jesus is not denying his own goodness but pressing the man to consider what calling Jesus good implies. If the man means good teacher in the ordinary sense, the correction stands. If the man means it in the sense that belongs only to God, then his instinct is correct but he has not yet followed it to its conclusion.