1 Corinthians 15:51

Behold,. tell you. mystery: We all shall not sleep, but we shall all be changed,

'I tell you. mystery' -'Listen,. will tell you God's hidden purpose!' (TCNT) The word 'mystery' doesn't refer to something that is incomprehensible (what's the use of telling someone something they can't understand?). Rather it refers to truth, which has remained unrevealed in the past. (1 Corinthians 2:7; Ephesians 3:3)

'We all shall not sleep' -'not all of us are to die' (Mof) This earth will contain living Christians when Jesus comes again. (1 Thessalonians 4:15)

'Some understood Paul to make an affirmation that "we" (including himself and some of the Corinthians) would not all die...Paul was exactly in the same position as any other Christian. He knew that the Lord was coming again but did not know when (1 Thessalonians 5:1). When, therefore, he speaks of what will happen to the living at the time of Christ's second coming, he included himself just as the rest of us do so frequently..' (Willis p. 586)

Point to Note:

Inspired Apostles discussed the Second Coming of Christ. And yet in all their discussion's dates were never given. (1 Thessalonians 4:13 ff; 2 Peter 3:4 ff) It's amazing then that modern religious groups have set dates. Therefore, anyone that has or will set. date for the Second Coming is claiming that they have access to "better" information than the Apostles did.

'but we shall all be changed' -'shall be made other..altered.' (Lenski p. 737) Obviously, changed into. state other than "flesh and blood".