The power and coming of Jesus Christ refers to his future return in glory (see Matthew 25:31; 2 Thessalonians 1:7–10).1 With this phrase Peter makes use of a hendiadys and thus the phrase might be better translated as powerful coming or coming in power (see Matthew 24:30; Mark 9:1; Mark 13:26; Luke 21:27; 2 Thessalonians 1:7; Revelation 4:11; Revelation 5:12; Revelation 17:13).2 Christ’s coming will occur at the final moment of the present age (1 Corinthians 15:23–24) and bring with it cataclysmic judgment for the ones who reject the gospel (2 Thessalonians 1:5–9; 2 Thessalonians 2:1–12). At his coming the day of the Lord will arrive (2 Peter 3:10–13).3
16 For we did not follow cleverly devised myths when we made known to you the power and coming of our Lord Jesus Christ, but we were eyewitnesses of his majesty.