Answer: This statement is the conclusion to the Parable of the Wedding Feast. Jesus spoke this parable to show what the kingdom of heaven will be like when the end of the age comes. In the parable, the King sends His servants out to gather the wedding guests to the wedding feast. But those invited refused to come, some because they were too busy with their own worldly pursuits and some because they were positively hostile toward the King. So the King commands His servants to go out and invite anyone they find, and many come and fill the wedding hall. But the King sees one man without wedding clothes and He sends him away. Jesus concludes by saying that many are called/invited to the Kingdom, but only those who have been “chosen” and have received Christ will come. Those who try to come without the covering of the blood of Christ for their sins are inadequately clothed and will be sent into “outer darkness".
So, all of God’s “chosen” will be saved without exception; they will hear and respond because they have spiritual ears to hear the truth. God’s power makes this certain. Romans 8:28-30: “And we know that in all things God works for the good of those who love him, who have been called according to his purpose. For those God foreknew (loved) he also predestined to be conformed to the likeness of his Son, that he might be the firstborn among many brothers. And those he predestined, he also called; those he called, he also justified; those he justified, he also glorified.
How do we know if we are among the few that have ears to hear? By responding to the call. Assurance of this certain call, this chosen call is from the Holy Spirit. Consider Philippians 1:6, which says: “…being confident of this, that he who began a good work in you will carry it on to completion until the day of Christ Jesus.” “Therefore, my dear friends, as you have always obeyed—not only in my presence, but now much more in my absence—continue to work out your salvation with fear and trembling, for it is God who works in you to will and to act according to his good purpose” (Philippians 2:12-13.) If we listen with our spiritual ears and respond to the invitation, there will be fear and trembling in our souls as we recognize that it was God’s work in us that caused our salvation