The point isn’t so much about being LESS wise and LESS learned. No, rather the point is to be humble, because knowledge can cause the possessor to become puffed up or conceited, arrogant.
“If anyone imagines that he knows something, he does not yet know as he ought to know.”
1 Corinthians 8:2
Jesus makes it clear that anyone who wants to enter the kingdom must be like a child, a humble child, that is teachable, willing and faithfully loyal.
“and said, “Truly, I say to you, unless you turn and become like children, you will never enter the kingdom of heaven. Whoever humbles himself like this child is the greatest in the kingdom of heaven.”
Consider that Jesus makes this very point
“In that same hour he rejoiced in the Holy Spirit and said, “I thank you, Father, Lord of heaven and earth, that you have hidden these things from the wise and understanding and revealed them to little children; yes, Father, for such was your gracious will.”
But the disciples were fully grown men, with businesses, careers and jobs. The secrets of the kingdom are not given to those who will exploit them for their own personal pleasure and gain, though many steal these treasures and market them as their own extorting money from people for selfish means.
“The former proclaim Christ out of selfish ambition, not sincerely”
“And in their greed they will exploit you with false words. Their condemnation from long ago is not idle, and their destruction is not asleep.”
2 Peter 2:3
Once again in conclusion. The issue isn’t about being wise and learned but being submissive to the Spirit.
“And I, when I came to you, brothers, did not come proclaiming to you the testimony of God with lofty speech or wisdom.
And I was with you in weakness and in fear and much trembling, and my speech and my message were not in plausible words of wisdom, but in demonstration of the Spirit and of power, so that your faith might not rest in the wisdom of men but in the power of God.”
1 Corinthians 2:1, 3-5
Like a child
“Truly, I say to you, whoever does not receive the kingdom of God like a child shall not enter it.””
Because self righteousness is pride and pride goes before destruction, trusting in your own knowledge/wisdom is also pride and trusting in your own strength is also pride. But a child trusts in his father and is dependent
“So Jesus said to them, “Truly, truly, I say to you, the Son can do nothing of his own accord, but only what he sees the Father doing. For whatever the Father does, that the Son does likewise.”
One must be willing to humble themselves in order to be obedient. Jesus obeyed to the end
“but emptied himself, by taking the form of a servant, being born in the likeness of men. And being found in human form, he humbled himself by becoming obedient to the point of death, even death on a cross.”
But a wise man in his own eyes is reprehensible and cannot be directed. And there are sufficient texts and revelations in Scripture that only those with a childlike humility can accept. The dead rising, the sun being created four days later after the light, the beginning being on day one, donkeys talking, blind seeing, paralyzed recovering, demonized being delivered, just to name a few. The learned and the wise will dismiss these are fairytales, hyperbole and wishful thinking.
“Trust in the Lord with all your heart, and do not lean on your own understanding. In all your ways acknowledge him, and he will make straight your paths. Be not wise in your own eyes; fear the Lord, and turn away from evil.”