"as St Paul points out, Christ never meant that we were to remain children in intelligence"

1 Corinthians 13:11 (KJV): "When I was a child, I spake as a child, I understood as a child, I thought as a child: but when I became a man, I put away childish things."

Ephesians 4:14-15 (KJV): "That we henceforth be no more children, tossed to and fro, and carried about with every wind of doctrine, by the sleight of men, and cunning craftiness, whereby they lie in wait to deceive; But speaking the truth in love, may grow up into him in all things, which is the head, even Christ."