When Christ said, “Be ye perfect,” it seems that He meant we should be perfect in our sphere; our mortal sphere. But what does that mean? Perhaps it means to be perfect in Christ. Meaning, “come unto Christ, and be perfected in him” (Moroni 10:32). I don’t think the Lord is inviting/commanding us to be as He is, or His Father is, now, but rather to accept Him as our Saviour, receive His saving ordinances, and believe in Him enough that we accept His grace, mercy and Atonement – to receive forgiveness, love, and the completing power to be perfect, or whole.
The only way we can be whole, ever, is through allowing Jesus Christ to complete us. We will never be 100% perfect, ever succeed 100%, ever do it right 100%. But that’s not our job. Our job is to do everything we can. Not everything, but all that we can. The Lord can make it 100% successful, because He is perfect. His “grace is sufficient for all men who humble themselves before” Him (Ether 12:27). God is the superpower. That’s His job. Ours is to believe in Him, trust, love and obey Him, and do our part – our best. And our best is not perfection; it never will be (at least in this life), and it’s folly to expect or desire it. We must rely on God – He is our only hope!
The Lord has said that He would gather us as a hen gathers her chicks under her wings – to protect, comfort and nourish them. In fact, perhaps even after this life, perfection will still mean that – we will always have been saved by Christ, on His merits, not our own; so any perfection we attain to will always be in Him. He is our Saviour and He always will be.