1 Corinthians 15:50

Now this. say, brethren, that flesh and blood cannot inherit the kingdom of God; neither doth corruption inherit incorruption.

Paul now consider's another possible objection to the resurrection, 'What will happen to those who are alive when Christ comes?' 'How can they be resurrected, seeing that they aren't dead yet?'

'Now this. say, brethren' -a transition in thought.

'flesh and blood' -'an earthly body made of flesh and blood cannot get into God's kingdom' (Tay) 'Our earthly (natural) bodies are not suited for eternal life.' (Willis p. 584) 'mean this mortal body, and may denote the living rather than the dead.' (F.F. Bruce p. 153)

'the kingdom of God' -the heavenly kingdom. (1 Corinthians 6:9; 2 Peter 1:11)

'corruption' -5356. phthora fthor-ah'; from 5351; decay, i.e. ruin (spontaneous or inflicted, literally or figuratively): -corruption, destroy, perish. This is the "real nature" of flesh and blood, i.e. that which is prone to decay and death.

'incorruption' -this refers to the kingdom of God. The real nature of heaven, eternal life is "incorruption". (1 Peter 1:4)

Point to Note:

Therefore heaven, eternal life will never become old or ordinary. Heaven will never lose it's lustre, it will never become routine or boring. Neither will the kingdom of God eventually disintegrate or break down.