Now the good of political life is a great political good. It is not a secular good specified by a comprehensive doctrine like those of Kant or Mill. You could characterize this political good as the good of free and equal citizens recognizing the duty of civility to one another: the duty to give citizens public reasons for one's political actions.
People can make arguments from the Bible if they want to. But I want them to see that they should also give arguments that all reasonable citizens might agree to.