If it fulfill the law (ton nomon telousa). Present active participle (conditional use of the participle) of telew, to finish, continually fulfilling to the end (as would be necessary). Judge thee (krinei--se). Unusual position of se (thee) so far from the verb krinei. With the letter and circumcision (dia grammato kai peritomh). Dia means here accompanied by, with the advantage of.