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.

The Bible (14th C BC - 2nd C AD) Christian sacred scripture

1 Corinthians 13:11 [KJV]
    (Source)

Alt. trans.: "When I was a child, I spoke like a child, I thought like a child, I reasoned like a child; when I became an adult, I put an end to childish ways." [NRSV]