He it is that loveth me (εκεινος εστιν ο αγαπων με). Emphatic demonstrative pronoun εκεινος: "that is the one who loves me."

And will manifest myself unto him (κα εμφανισω αυτω εμαυτον). Future active of εμφανιζω, old verb from εμφανης (Acts 10:40; Romans 10:20). The Unseen and Risen Christ will be a real and spiritual Presence to the obedient and loving believer.