They come from a number of sources. Some are even innate, the one you mentioned about the Bible is a societal influence source.This question came up in another topic and I wanted to turn it into a debate because I'm curious what people have to say about this. This question is for atheists and agnostics. How do we know what's right and wrong without the Bible? How does the government decide what's right and wrong without the Bible? Where does morality come from without the Bible?