In my pride, I thought no one understood my heart as well as I did. But Scripture doesn’t support such a conclusion….Without others’ help to see myself clearly, I’ll listen to my own arguments, believe my own lies, and buy into my own delusions.
This quote is from “Humility: True Greatness” by C. J. Mahaney
PDF 
Did you see Amazing Grace yet? For another biography of Wilberforce, check out http://www.ericmetaxas.com. Metaxas has taught for World Journalism Institute (not when I was there). The book looks pretty good.