“Young Life for grown-ups.” And the visitor wasn’t just referring to the high concentration of young adults. Keller followed the Young Life calendar in his preaching. In the fall, he focused on apologetics, especially through sermons from the Old Testament on the nature of God. In the winter, he shifted to the life of Jesus, culminating in the cross and resurrection for Good Friday and Easter. Spring and summer worked out salvation with application on how to live as a Christian.