When He said, Be perfect, He meant it. He meant that we must go in for the full treatment. We are like eggs at present. And you cannot go on indefinitely being just an ordinary, decent egg. We must be hatched or go bad.
Damnation is the mirror image of sanctification.
It is the consequence of thoroughly refusing to love God closing ourselves off entirely from the Holy Spirit. These are our only two choices. We must be hatched or go bad. God is a gracious and merciful Father who patiently and lovingly pursues his project of perfecting us. If we have opened our life to God, we can trust him to finish the job.