QUOTE(kkb888 @ Jan 13 2016, 11:13 AM)
But Kings David and Solomon since they are "Kings" I suppose they must have acquired good intellectual knowledge in order to rule the country? Even acquired after in their late life and before writing the bible?
Moses was also brought up in royal family in Egypt so I assumed him also had received proper education since he was a kid...
All happens because of the anointing of God.
1 Samuel 16:13 (NIV)
So Samuel took the horn of oil and anointed him in the presence of his brothers, and from that day on the Spirit of the LORD came
powerfully upon David. Samuel then went to Ramah.
You'll noticed that David changed from being a simple shepherd boy to having Kingship quality in administration and leadership. He didn't acquire that by mere self effort.
Same with Moses.
All as enabled by God and the saying is true, God will not call you to do something without enabling / providing you to do it. They became who they are because of God.
QUOTE(kkb888 @ Jan 13 2016, 11:18 AM)
And God often chose the "fool" in order to shame the "wise", in order to show his glory

Yes this showing of Glory is something that help us understand God is for the destitute and unwanted; not to show off God just like that as how sceptics might think.
And another reason is to magnify God's Grace. Meaning Moses is basically represents you and I. God delights in choosing unqualified as well as qualified people, He does not have prejudice.
The world only expect the best to be on top, the fastest, the smartest, the strongest, etc etc not so with God. God can enable anyone as long as they are willing.