Against popular opinion of lukewarm people, God expects perfection from His own.  To some, this is inconceivable and to others it is impossible to be true.  Many of us are very familiar with Matthew 5:48, which reads, Be ye therefore perfect, even as your Father which is in heaven is perfect.  Even with this word coming from Jesus Christ, there are still those who will boldly refuse this commandment.  There are phrases such as, no man is perfect and God knows we will never be perfect, along with many other excuses to negate the command to be perfect.  It is true that no man is perfect.  No one can be perfect in and of themselves, but what isn't true is that God knows we will never be perfect. 

Here's what must be understood; there is no one who can be in the presence of God unless they are perfect.  When God sent Jesus to wash away the sin of man, it was so we can be perfect.  All who shall live perfect can only do so when they do so in Christ. 

I in them, and thou in me, that they may be made perfect in one; and that the world may know that thou hast sent me, and hast loved them, as thou hast loved me.  John 17:23

God remedied that imperfect problem which had been an issue for some time.  The Old Testament is filled with many examples of God's disapproval of imperfections.  One of those incidences found in the book of 2 Samuel 6.  God told them that no one to touch the ark, but Uzzah did.  It angered God, He struck him and Uzzah died for his disobedience.  There are those who might infer that this is the old covenant and God doesn’t respond that way anymore under the new covenant.  He is merciful, this is true, but He is also God who changes not. (Malachi 3:6)

Under the new covenant we are given grace until we come to the knowledge of Jesus.  In, Matthew 11:29, Take my yoke upon you, and learn of me; for I am meek and lowly in heart: and ye shall find rest unto your souls.  When the knowledge of God is obtained and obeyed, the perfection of God is performed.  There are many who are asking God to give them the strength to do what they are commanded to do.  Others are waiting on God to make them perfect.  This will never happen.  Perfection will come as willingness and obedience is accomplished.  The idea that no one can be perfect is crushed by the words of the Redeemer:

Then said Jesus to those Jews which believed on him, If ye continue in my word, then are ye my disciples indeed; and ye shall know the truth, and the truth shall make you free. (John 8:31 & 32)

Disciples are them that follow Jesus.  When one follows Him, they do what He says.  Because God expects perfection from us, it is achievable as we keep the words of Jesus Christ.  Doing what He says is the way to give God what He expects.  In conclusion, there is an assurance that God will not instruct anyone to do anything that will cause one to be imperfect!