These notes remind me of teaching I started long years ago, and each one recalls my dear students, with their shining faces, and the questions they asked with their believing hearts and pure spirits. I wanted to talk them in these lines and pages, and to listen to them. I wanted them to keep asking me so I could answer them. Because they want to listen and understand and believe. If this book serves their religious belief only a little, I will be truly happy. I dedicate it to all my students from the first