In Mark 8:33, Jesus rebuked Peter with the weight that was unmatched with any other occasions.
One would greatly admire Peter's desire to maintain his zeal for the Lord, despite multiple failures.
This is the true heart of a follower, lest his heart be not genuine.
Not genuine...is that only what the verse is disproving? Or is it teaching us the wisdom in the time and place and person to rebuke? This I do not know. So I will categorize it as Questions as well.