34 Jesus replied, “Marriage is for people here on earth. 35 But in the age to come, those worthy of being raised from the dead will neither marry nor be given in marriage. 36 And they will never die again. In this respect they will be like angels. They are children of God and children of the resurrection.
In Chapter 20, we see the Pharisees trying to trap Jesus in arguments regarding the Law . Then, Jesus tells the story about a farmer who sends his servants to collect the harvest of his vineyard, and each time the wicked tenants kill the servant. This is representative of the prophets he sent to Israel. Finally, he sent his Son and they killed him too. This is an obvious reference to sending Jesus first to the Jews.
The leaders are furious and try to trap Jesus again to no avail. Finally, the Sadducees question Jesus about the resurrection. Since they don't believe in the resurrection, they try to trip up Jesus on a technicality about who a widow's husband is in the resurrection, since she had seven husbands. Once again Jesus shows them that they are way out of their league. The resurrection has nothing to do with marriage, an institution here on earth. In heaven, we will be children of God and part of the family of God. At the end of the day, an earthly analogies breakdown. In Corinthians Paul says, "No eye has seen or eye has heard what God has prepared for those who love them."
You will notice that Jesus is not afraid of their arguments. He addresses them and confounds their earthly wisdom. Often people's questions are a smokescreen when they feel convicted about their own sin, like the religious leaders. This is why we need to understand what we believe, so we can be prepared to give a defense for what we believe in and why. See 1 Peter 3:15
If you were confronted by people like the Pharisees or Sadducees, would you be able to respond convincingly? That is why it is important as disciples to be lifelong learners. A mature believer can ready at anytime to give an answer, a defense of what they believe.