"Imagine there's no heaven ..."
… For if there were no God, no republic, no society in the world would be safe. Without virtue, without religion, nothing can be safe. If here were no God, there be neither virtue nor religion. What would the world be but a mere den of robbers in which license would be each one’s law, no such thing as right or wrong, no right of government, no necessity of obedience—the most abandoned, the superior and the most powerful, the master? No check would be placed upon the oppression of rules and the rebellion of subjects. Each one would follow the bent of his own inclination. Again, if there were no God, no mortals would even for a moment be safe or secure from violence, fraud, perjury, slaughter of blood. Every hour everything would have to be feared. Take away the barriers of divinity and what would become of confidence and innocence? What license or violence would not be witnessed? As to human edicts (besides the fact that they cannot change the mind for the better, but on the contrary make it artful and intent upon all the arts of deception), what place would there be for human laws, if (the sense of deity being removed) the conscience would shake off all relations of justice and injustice?
[Turretin, Institutes, 3.I.21]