true calvinism (historical calvinism) does not teach that god chooses who will be saved and who will not be saved. instead, it teaches that for god's own glory, he recreates men with a new nature - a nature that loves god and hates sin - instead of men keeping their old nature, as if they kept their old nature, they would not want to follow god. historical calvinism also teaches that if god did not choose to save someone, there would be no-one to be saved.