'Perfection' in the Bible

while night and day, with intense earnestness, we pray that we may see your faces, and may bring to perfection whatever may be still lacking in your faith?

Finally, believers, we ask and admonish you in the Lord Jesus, that you follow the instruction that you received from us about how you ought to walk and please God (just as you are actually doing) and that you excel even more and more [pursuing a life of purpose and living in a way that expresses gratitude to God for your salvation].