In the book of Revelation it talks about the saints overcoming satan with the blood of the Lamb and the word of their testimony. Testimonies are powerful in inspiring hope.
One of the best sources of testimonies that I have found is at Rejoice Ministries. From their home page click on Restored Marriages, then Testimonies, or you can sign up for the daily devotional Charlyne Cares which dedicates every Saturday to testimonies. If you are discouraged about the prospects for marriage restoration, you will surely find hope there.
The DVD series, Choosing Wisely Before You Divorce, and the Divorce Care series, both have some awesome testimonies on DVD. Go to www.divorcecare.org.