Seeing you have purified your souls in your obedience to the truth through the Spirit in sincere brotherly affection, love one another from the heart fervently:
Through the Spirit - By the agency of the Holy Spirit. It is his office to apply truth to the mind; and however precious the truth may be, and however adapted to secure certain results on the soul, it will never produce those effects without the influences of the Holy Spirit. Compare Titus 3:5-6; the notes at John 3:5.