Verse 22< strengthening and establishing the hearts of the disciples; encouraging them to remain firm in the faith, saying,"it is through many tribulations and hardships that we must enter into the kingdom of God."

Christians should have faith, not just having faith but also be ready for trials and tribulations. We all will face trials and tribulations, so therefore we should not relent our efforts on the things of God but rather ask God for grace to do his work so that in the last day we will all enter into the kingdom of God. Thanks@reliquary.