As we pursue a study on Sunday mornings related to money and possessions, a super-helpful (and really short) book on giving and generosity is by Randy Alcorn, The Treasure Principle: Unlocking the Secret of Joyful Giving. Get it and read it. You will be really glad that you did. When our view and stewardship of money and possessions are affected by radical grace, watch out!
For a pdf version of Chapter 1 of The Treasure Principle, just go to this link: The-Treasure-Principle-by-Randy-Alcorn-Chapter-1