“Who has in memory and keeps in life” (Augustine).
Will manifest (ἐμφανίσω)
Properly, of manifestation to the sight, as distinguished from δηλόω, to make evident to the mind (1Co 3:13; Col 1:8, etc.). A clear, conspicuous manifestation is indicated. Compare ye see me (Joh 14:19). “It conveys more than the disclosing of an undiscovered presence (ἀποκαλύπτω), or the manifesting of a hidden one (φανερόω)” (Westcott).