Audio and Multimedia
...If Christ died for all of the sins of all people, that must include the sin of unbelief. If God's justice is totally satisfied by Christ's work on the cross, then it would follow that God would be unjust in punishing the unrepentant sinner for his unbelief and impenitence because those sins were already paid for by Christ.
R.C. Sproul
[If Jesus died for all men]...why then, are not all freed from the punishment of all their sins? You will say, "Because of their unbelief; they will not believe." But his unbelief, it is sin, or not? If not, why should they be punished for it? If it be, then Christ underwent the punishment due to it. If so, then why must than hinder them more than their other sins for which he died from partaking of the fruit of his death? If he did not, then he did not die for all their sins.
John Owen