If he doesn't have a God to believe in he doesn't know where to find a moral code to adhere to. If this happens he has to take morality and power into his own hands, and is able to do whatever he feels like without fear of being unjust - that's what the gun means.
Hmmm....
'If God does not exist, everything is permitted.'
If he doesn't have a God to believe in he doesn't know where to find a moral code to adhere to. If this happens he has to take morality and power into his own hands, and is able to do whatever he feels like without fear of being unjust - that's what the gun means.