Problem: Mark 10:14-15 claims that we should become like children, but this passage states that we shouldn’t become like children. Which is true?
Solution: These passages are given in two entirely different contexts. Mark 10 is given in the context of the self-righteousness of the Pharisees (Mk. 10:1-12) and the pride of wealth (Mk. 10:17-31). However, Ephesians 4 is given in the context of false teaching (“…carried about by every wind of doctrine, by the trickery of men…”). Therefore, God wants us to be like a child in regard to our dependence and trust. However, he doesn’t want us to become like children in regard to ignorance or gullibility.
“That we henceforth be no more children, tossed to and fro, and carried about with every wind of doctrine, by the sleight of men, and cunning craftiness, whereby they lie in wait to deceive; (Eph 4:14)”