“So Peter, seeing him (John) said to Jesus, ‘Lord, and what about this man?’ Jesus said to him, ‘If I want him to remain until I come, what is that to you? You follow me!’” (John 21:21-22).
Instead of worrying about his own faithful discipleship, Peter is concerning himself with the fate of John. Given his track record, it seems Peter would give greater attention to his own ability to follow Jesus and how to obediently pursue that calling. Our faithful following of the Lord should never be determined by what others are doing or not doing. If our desire is to pursue in earnest the path that the Lord has set before us, then our plate is full and there is no time for the distractions of pettiness.