Does not scripture stand alone without the opinion of man? God chose Solomon the be A SON unto HIM and God his FATHER.....
Did God not say, "I choose who to have mercy upon and who not to have mercy upon"?
But God has His reasons and with Solomon God gave a promise to David about how He would deal with Davids son.. Did not Solomon by His own free will ask God to give him wisdom and was God not pleased with Solomon for not only asking for wisdom but for the reason he asked for it?
Yes God chooses whom He will have mercy on and whom he will not have mercy on.. But he does not select people at random. He has reasons for doing so, reasons that include the persons own free willed response to the will of God..