The Baltimore Catechism #1 expands on the foundation laid previously in the First Communion Catechism. Together they lay a foundation for all of Catholic doctrine that follows. The doctrine is clear, and the method is perfect for little children. They rejoice in their ability to memorize.  The text is distilled St. Thomas; as such it actually improves the student’s ability to think, for it gives him a precise vocabulary. As a result of using this text students have better tools for thinking, and a model of cogent thought.