Book excerpt: Catechetical Sessions on Christian Morality is a rich course that gives young people a solid grounding in the foundations of Christian morality, to add to what they have already received in their faith community and in their family. The manual presents young people with the fundamental concerns of the moral life in a Catholic Christian context. Above all, the course is an invitation to young people to build God's Reign by loving themselves and others as God loves them. In other words, it is an invitation to become holy, healthy, and happy. In doing so, they will bring God and the world together!