Hebrews 5:10

8though he was a Son, yet learned obedience by the things which he suffered.

9Having been made perfect, he became to all of those who obey him the author of eternal salvation,

10named by God a high priest after the order of Melchizedek.

11About him we have many words to say, and hard to interpret, seeing you have become dull of hearing.

12For although by this time you should be teachers, you again need to have someone teach you the rudiments of the first principles of the revelations of God. You have come to need milk, and not solid food.