'It is Impossible' in the Bible

And we will do so [i.e., go on to more advanced teaching] if God allows us to. For it is impossible to get people who have [completely] fallen away [from God] to repent again, because they [continue to] crucify for themselves God's Son all over again, and hold Him up to contempt.

He did this so that by two unchangeable things [i.e., His promise and His oath], (and it is impossible for God to lie), we, who have fled [to God] for refuge, could be greatly encouraged to take hold of the hope set before us [i.e., the hope of never ending life].

because it is impossible for the blood of bulls and goats to take away sins.

And unless one has faith, it is impossible for him to be pleasing to God, for the person who comes to God must believe that He exists and that He rewards those who seek Him.