"Apostle" Paul said:

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.

Messiah said:

Matthew 18:3-4 (KJV)

And said, Verily I say unto you, Except ye be converted, and become as
little children, ye shall not enter into the kingdom of heaven.
Whosoever therefore shall humble himself as this little child, the
same is greatest in the kingdom of heaven.