Matthew 18:3
And he said: “I tell you the truth, unless you change and become like little children, you will never enter the kingdom of heaven.

Is it possible that a child could be more wise than an adult?  The real question should be is a person who has not learned anything wiser than someone who has learned false truths?  I think much of what God needs to do in our lives is help us to unlearn things.  A young child is wise enough to trust.  As an adult, we need to learn to trust again.  If we cannot trust, then we cannot trust God.  We need to unlearn the lies we have believed regarding trust and God and become practiced in loving and trusting God.