"For a person to be fully alive, as a human being, grace is absolutely necessary," said Father Brian Mullady, O.P., author of books, including "Grace Explained: How to Receive — and Retain — God's Most Potent Gift" (Sophia Institute Press). "One of the reasons I wrote the book is because [in] giving parish missions around the country, I found out that most Catholics are clueless now as to what sanctifying grace means for them...The Council of Trent was very clear that said justification by grace means the forgiveness of sins, yes, but also the sanctification and renewal of the interior person. So they don't realize they can have a relationship or friendship with the Holy Trinity."