I always liked First Corinthians 13: "When I was a child, I spoke as a child. I understood as a child. I thought as a child. But when I became a man I put away childish things."
I read this riff on the passage by Edward D. Griffin and enjoyed it, it's all his words next -
In childhood the mind, pleased with every trifle and void of care, vacantly pursues its little pleasures, and, blessed with ignorance of the ills and disappointments of life, looks forward with sanguine hopes to fairy scenes of happiness; while the bright and tearless eye, resting on the outside of things, sees a paradise in every lawn and grove. A recollection of these childish delights is often cherished with rapture in future years, while the man, forgetful of the frettings and whining of childhood, indulgently inquires, Why were the former days better than these? But he does not ask wisely concerning this. A virtuous manhood is much more to be desired than the state of children. It is capable of far nobler pursuits, of knowledge, enjoyment, and action more congenial with the ends of our being. The child has no high and manly aim, no cares for great and dignified things, little thought for his future well being either in this life or the life to come. His understanding is feeble, his knowledge is small, his pursuits and pleasures are useless to the world, his years are trifled away in pursuing airy visions, and he is a stranger to elevated and substantial happiness. He speaks as a child, prattling unconnectedly of his little concerns; he understands as a child, superficially and contractedly; he thinks as a child, incorrectly and inconsistently; but when he becomes a man he puts away childish things. His taste relishes nobler objects; his conversation is more dignified; his conduct and pursuits are manly; his views and knowledge are enlarged. Spurning the shackles and toys of babyhood, he becomes perhaps a philosopher, and explores with astonished gaze the works of his Creator. His unrestricted fancy, not confined to the policies and interests of kingdoms, wanders among the stars, and delights itself with the numberless worlds which revolve above his head, while his faith and knowledge are employed on the great affairs of the kingdom of God.