Predestination done before the consideration of works?

"Paul concludes that no respect of works existed in God's election of His people, because He preferred Jacob to his brother before they were born, and before they had done 'either good or evil.' But these opponents of election, to make good their doctrine, that those were chosen of God whom some mark of goodness distinguished from the reprobate, would make it appear that God foresaw what disposition there would be in each person to receive or to reject offered grace." - John Calvin, The eternal Predestination of God