Sura 14:4 - We have sent no Messenger except in the tongue of his own nation, so that he might make everything plain to them. But Allah leads astray whom He will and guides whom He will. He is the Almighty, the Wise.
Sura 16:93 - Had Allah willed, He would have made you one nation. But He leads astray whomsoever He will and gives guidance to whomsoever He will. You shall be questioned about what you did.
How does one go about reconciling the above with free will?