Confirming the souls of the disciples, and exhorting them to continue in the faith, and that we must through much tribulation enter into the kingdom of God.
If we then must endure many tribulations on our way to heaven, then tribulations are vital in order to enter heaven. We enter heaven only through the completed work of Christ on the cross of course, but tribulations make us dependent, humble, broken and conformed into the image of Christ Jesus.
If you do not endure these tribulations and enjoy a life of success, prosperity and wealth, then this is a huge indicator that God does not love you and in fact you are not going to heaven.
If God is putting you through the ringer and crushing you, breaking you, stretching you and peeling everything away from you, then this is perfect evidence that He loves you and is conforming you into the image of His beloved Son, Jesus Christ.
This is why we are told to…count it all joy when ye fall into divers temptations(trials and tests).
If you are a Christian and strive to make your life as safe, comfortable and successful as possible, then you are in serious danger. This road you are on is the broad road. The easy road. The road to hell.
Be afraid…be very afraid.