If we are focusing too much on perfection, we are giving the adversary an IN by making ourselves more vulnerable to his influence. He will use our imperfections to discourage us. Ultimately we can convince ourselves that it is too hard. If we are focusing too much on perfection, we are more easily persuaded to give up completely and push us from the straight and narrow.
Perfection is not the absence of mistakes or flaws. It is about perseverance. It's about moving forward and correcting our mistakes as we go along.