A child (νηπιος). See on 1. Corinthians 3:1 for νηπιος in contrast with τελειος (adult).

I spake (ελαλουν). Imperfect active, I used to talk.

I felt (εφρονουν). Imperfect active, I used to think. Better, I used to understand.

I thought (ελογιζομην). Imperfect middle, I used to reason or calculate.

Now that I am become (οτε γεγονα). Perfect active indicative γεγονα, I have become a man (ανηρ) and remain so (Ephesians 4:14).

I have put away (κατηργηκα). Perfect active indicative. I have made inoperative (verse 1. Corinthians 13:8) for good.