He is the Rock; his deeds are perfect. Everything he does is just and fair. He is a faithful God who does no wrong; how just and upright he is! [Deuteronomy 32:4 (NLT)]
But you are to be perfect, even as your Father in heaven is perfect. [Matthew 5:48 (NLT)]
Although humanity started out as a perfect creation, we quickly lost that perfection in the Garden of Eden; Jesus was the only sinless perfect man. If He’s telling us to be perfectly sinless when He calls us to be perfect, we’re in trouble. I suppose we should be able to resist all sin (as did Jesus) but, in reality, no one else (not even the Apostle Paul) has managed to do that. Perfection is God’s alone and we flawed mortals will never be His equals. If Jesus means things like spotless kitchens, beds made with hospital corners, and clean mirrors when He says to be perfect, even without having guests, I’m still in serious trouble. Yet, Jesus’s answer to the rich young man that, to be perfect, he should sell his possessions and give to the poor tells us that possessions and how neatly they’re arranged have no importance to Him. So, what does it mean to be perfect?
Of course, Jesus wants us to be as flawless as humanly possible. Nevertheless, He isn’t expecting us to be completely faultless. By telling us to be perfect, He’s telling us to reflect the moral excellence of God, something God told people to do centuries earlier when He said, “Be holy because I am holy.” [Leviticus 19:2] Jesus is asking us to imitate God, just as children imitate their parents. The original Hebrew word used in this verse was tamim. Rather than perfect (meaning without fault, flaw or defect), it might better be translated as complete in all its parts, full grown or mature. Jesus is the standard by which we set our goal and He wants us become mature in our faith by growing more like Him.
The Pharisees tried to achieve perfection through exacting obedience to the law but, while they looked good on the outside, they were soiled inside (and Jesus took them to task for that). Our perfection will never be found their way. By telling us to be perfect, our words and actions are to match up with our faith. Jesus wants us to be resolute, wholehearted and completely committed to walking with Him and living His way. We’ll become perfect by living through the power of the Holy Spirit: by letting God’s glory shine through our imperfect and flawed lives into the world. Our call is not to have spotless mirrors but to mirror the spotless character of God.