In entering upon this course of instruction, each of you should, so far as possible, lay aside, for the time being, all previous theories and beliefs. By so doing you will be saved the trouble of trying, all the way through the course, to put "new wine into old wineskins" (Lk. 5:37). If there is anything, as we proceed, which you do not understand or agree with, just let it lie passively in your mind until you have read the entire book, for many statements that would at first arouse antagonism and discussion will be clear and easily accepted a little farther on.