In the two simple questions addressed in this book-"What does it mean to love Jesus?" and "Who is my neighbor?"-we hear the heart- beat of the Christian faith. This is what faith confesses in its innermost being. In New Testament terms it is the twofold obligation of the Great Commandment. In his theological reflection on these apparently self- evident questions, Karl Rahner shows that they are actually laden with mystery, existential questions that are pressing for an answer at all times in the life of any Christian.