sn ExSyn 116, which notes that the grammar is not decisive, nevertheless suggests that “the faith/faithfulness of Christ is not a denial of faith in Christ as a Pauline concept (for the idea is expressed in many of the same contexts, only with the verb πιστεύω rather than the noun), but implies that the object of faith is a worthy object, for he himself is faithful.” Though Paul elsewhere teaches justification by faith, this presupposes that the object of our faith is reliable and worthy of such faith.
sn The adjective perfect comes from the same root as the verb perfected in v. 12; Paul may well be employing a wordplay to draw in his opponents. Thus, perfect would then be in quotation marks and Paul would then argue that no one – neither they nor he – is in fact perfect. The thrust of vv. 1-16 is that human credentials can produce nothing that is pleasing to God (vv. 1-8). Instead of relying on such, Paul urges his readers to trust God for their righteousness (v. 9) rather than their own efforts, and at the same time to press on for the prize that awaits them (vv. 12-14). He argues further that perfection is unattainable in this life (v. 15), yet the level of maturity that one has reached should not for this reason be abandoned (v. 16).