How Can We Earn Salvation if It Is God Who Decrees Who Will Sinne and Who Will Be Righteous?

Calvin is in full agreement with luther. Salvation is not merited through good works, or even by wishing to be good. Instead, god decides before we are even born, who will be among the elect and who will be reprobate. If any one object that this is beyond his comprehension, i confess it. But what wonder if the immense and incomprehensible majesty of god exceed the limits of our intellect?