1 Corinthians 2:10

And Jesus answered and said to them, “To you it has been given to know the mysteries of the kingdom of heaven, but to them it has not been given.

For I do not want you, brothers, to be uninformed of this mystery—so that you will not be wise in your own estimation—that a partial hardening has happened to Israel until the fullness of the Gentiles has come in;

And even if our gospel is veiled, it is veiled to those who are perishing,

For I neither received it from man, nor was I taught it, but I received it through a revelation of Jesus Christ.

But the Spirit explicitly says that in later times some will fall away from the faith, paying attention to deceitful spirits and doctrines of demons,

‘But I say to you, the rest who are in Thyatira, who do not have this teaching, who have not known the deep things of Satan, as they call them—I place no other burden on you.