To avoid all misconceptions it should be made clear at the outset that the fact that God wishes or wills that all people should be saved does not necessarily imply that all will respond to the gospel and be saved.
We must certainly distinguish between what God would like to see happen and what he actually does will to happen, and both of these things can be spoken of as God’s will.
The question at issue is not whether all will be saved but
whether God has made provision in Christ for the salvation of all, provided that they believe, and without limiting the potential scope of the death of Christ merely to those whom God knows will believe.
I.H. Marshall