I had kept a note from Storey when she was 7 with my notes to illustrate child-like reasoning. Check out the scanned note attached here. That IS an example of both child-like spelling AND reasoning. Cute, but inaccurate. Cherished by a Dad, but her reasoning would never win a national mock trial tournament.
Paul went on to say that now that he was a man he put away childish things like public displays of ecstatic utterances to prove one's spirituality. (v. 11, 12) He had picked up the adult-like work of love, which was not as cute, but made a difference in the lives of those he served.
It was great to run across a note from my child who is 25 years old, married, and pregnant with our first grandchild, but I am also pleased she has learned to spell and reason to fit her age. I wish some Christ followers would do the same.