The book is The Moral Vision of the New Testament by Richard B. Hays. Because the first two paragraphs are primarily Scripture quotations, I am posting this:
Already in Aristotle's Nicomachean Ethics, it is assumed that the ideals of sharing and unity of soul between friends are truisms: "All the proverbs agree with this: 'Friends have one soul between them' and 'Friends' goods are common property.'" Thus the Jerusalem community embodies in its life together the Greek vision of authentic friendship, not just between two people or within a small intimate circle but exponentially expanded into life of a community of thousands. Hostility, mistrust, and selfishness are replaced by a communal ethic of sharing that treats all members of the community as friends in accordance with the philosophical ideal.
I am supposed to tag five people, so I tag Nick, Doug Groothius, Stan, Brian, and James Gibson.