For to this end we both labor and suffer reproach, because we have set our trust in the living God, who is the Savior of all men, especially of those who believe.
Jesus died for the sins of the world. But only those who believe receive the forgiveness of sins. Jesus died to redeem the world, but He will only take His treasure out of it. And so He died and is the Saviour of all men, but specifically those who believe. He provided salvation for all men, but not all have received it.