Perfection

Nobody is perfect because we can't achieve perfection. But perfection can be reached. It can't be reached by our effort as we ourselves are imperfect and cannot yield perfection, thus we need something (or someone) which is perfect, and that is God. 

He is known to ask humans for things who are impossible or very difficult for us to achieve, but He only does that to teach us we can't alone. That's why He asked us perfection:

"Be perfect, therefore, as your heavenly Father is perfect."

NIV Matthew 5:48

So it means perfection is somehow achievable, we must just ask God for it through Christ:

"And I will do whatever you ask in my name, so that the Father may be glorified in the Son. You may ask me for anything in my name, and I will do it."

NIV John 14:13,14

"Now to him who is able to do immeasurably more than all we ask or imagine, according to his power that is at work within us..."

NIV Ephesians 3:20

God can do what is unimaginable for us and He does much more than He's asked if we have Him within us. So, are we imperfect? Yes, but perfection is reachable; there's no excuse not to try.