The most important time of preparation is the time before going to sleep; you should read a passage or two for half an hour or fifteen minutes before you go to sleep. Sometimes two sentences or two words are enough. These thoughts are what one falls asleep with, and he passes through the entire night and wakes up with them in the morning. Sometimes one reads for 20 minutes or listens to music. It doesn't matter exactly what, however, before going to sleep, one must find inspiration with which he will wake up in the morning. A person begins the preparation for the following day in the evening. In other words, one is forbidden to get up in the morning ('forbidden' means that one cannot agree to it, and 'morning' means before the lesson) with an empty head and an empty heart. If he feels the emptiness, this only means that he did not get ready before sleep. This is absolutely so; there is no other reason.