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:
unto unfeigned love of the brethren: "Unfeigned" (anupokritos) means "unfeigned, undisguised" (Thayer 52-1-505). Obedience has brought us into a right relationship with God and with one another. "Love of the brethren" (philadelphia) means "the love of brothers (or sisters), brotherly love, the love which Christians cherish for each other as brethren" (Thayer 653-1-5360).