_{Inspired by the question Is a moral society more open to the gospel than an immoral one?.}

Are people, by nature, good? Meaning, do people tend to and want to do good things and help out others?

Or are people evil by nature? In other words, do people tend to be egoistical, to the point of being willing to do harm to others for their own benefit?

I've heard that some humanists believe that people are, by nature, good people. That people, in general, want to help others, support each other's causes, and do things to benefit others over themselves.

What does the Bible say about this? Are there other extra-biblical Christian documents/doctrine to support one way or the other?