interesting question.
In my humble opinion, God’s will and man’s free will are two very different things…and Jesus, who had both human and divine nature, may have been pointing that out in the passage you reference.
God’s will is truth, and man’s free will can (and more often than not, because of the Fall) be flawed.
When the two are in concert, all is well…when they are not, God’s will prevails…but fortunately, through His divine mercy (as evidenced by the Sacraments), our fallen nature does not mean we are not given an opportunity for conversion.