The Gospel of Luke recounts that Jesus, after entering the city of Jerusalem, gave important teachings about the Kingdom of God. And one of these teachings was about the resurrection of the dead, a teaching that has a special significance for Christians, because it is related with the eschatological hope about the triumph of good over evil.
And the Gospel of Luke relates that Jesus was teaching in the temple of Jerusalem, and some Sadducees who denied the resurrection approached him, and there the Sadducees posed a problem to Jesus with the intention to find him in a contradiction. And so they asked Jesus what would happen after the resurrection with a woman who married, in due course, seven brothers successively without leaving offspring. And that is how Jesus answered them with wisdom: "The people in this world get married. But in the future world no one who is worthy to rise from death will either marry or die. They will be like the angels and will be God's children, because they have been raised to life" Luke 20:34-36.
For Jesus, the Sadducees, with their reasoning, were seriously mistaken, something the divine teacher warned them about. But this was due to a fundamental issue: those who are subject to concupiscence, like the Sadducees, will logically fall into error and heresy. Those who live according to the flesh discern in one way, and those who live according to the Spirit discern in another; this is the crux of the matter. Contradictions and confrontations between these two mentalities will always occur, and this was the case with Jesus.
What Jesus meant to teach with his answer is that those who rise from the dead will dedicate themselves, like the angels, to their primary function, which is the contemplative life. This is because contemplation is the activity proper to spiritually pure beings. Ultimately, the Kingdom of God cannot be perceived by those who are subject to error.
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