3:18 grow in . . . knowledge. This knowledge is the ever-deepening experience of Christ and understanding of His truth that should characterize the entire course of the believer’s life, as opposed to the pretentious, esoteric “knowledge” of the false teachers.
To him be the glory. This statement presupposes the deity of Christ (v. 12; 1:1 notes). It ascribes glory directly to Him (Rev. 1:5, 6).
to the day of eternity. Glory belongs to Christ both now and throughout the endless day that will dawn when He comes again (1:19; Is. 60:19, 20).