Our will is insignificant, and further, our power is puny!
Even if all men had the desire to be saved (which we know that fallen, depraved man does not), he does not have the ability to move toward Christ. Salvation begins and ends in the will and power of God.
By the Will of God
If a man is called by the will of God to preach how can he rightly preach that salvation is by the will of man?