This was the main theme of the talk. The only real way to combat the evil "out there" is to combat the evil inside.
For some reason, this really struck me -- highlighting my own continuing struggle with temptation and sin, my need for God's grace, and my own call to continue to grow in holiness. I think it was Chesterton who said something along the lines that religion was the cure for evil, the evil in man's heart. And Fr. Hecker (the founder of the Paulists), learned early on, as he was becoming a Christian, that his efforts to promote workers' rights and justice at Tammany Hall in New York would ultimately only work if he first was converted himself, and worked on transforming mens' souls.
This is not to say that one only looks inwards, and that Christians aren't called to work to transform society around them. Obviously not. It's not an either/or, though. However, Christians cannot neglect interior conversion -- for it was to heal our souls from sin that Our Lord came.
The evangelist on the radio was of course Ravi Zacharias. I'd never heard him at all, though I've encountered his books once in a while in the religion aisle at B&N. I don't know much else about him or his ministry. This one sounds rather interesting right now -- "Beyond Opinion: Living the Faith We Defend"
Respected apologist Ravi Zacharias was once sharing his faith with a Hindu when the man asked: "If the Christian faith is truly supernatural, why is it not more evident in the lives of so many Christians I know?" The question hit hard, and this book is an answer. Its purpose is to equip Christians everywhere to simultaneously defend the faith and be transformed by it into people of compassion