Unificationists must understand the Principle clearly. Among the American people there is not even one who understands the Principle clearly. You do not know the Principle. In my perspective, all of you do not understand the Principle. You think that you understand! I do not know why it is so, but people lecture the Principle in their own ways and think it in their own ways. This is how it is. You can see this when you observe how the president of the American church lectures. There are many things that he won't be able to answer if I asked him about them. I do not even have to mention how all of you are.

All of you have studied the Principle, right? Do you all know what contents are in what page? Do you know what is written on page 556 and what its meaning is? This is the same as your own body. Would it be acceptable if you do not know in what parts of your body there are freckles and moles? (167-328)

If you are going to lecture, you have grasp all the core contents of the Principle using whatever means you can. Before me, you have no excuse to say that you cannot lecture.

When you listen to many lectures, you should observe everything such as the lecturer's expression, saying to yourself, "Oh, this is how that person lectures." As you begin to speak about a section in the chapter on the Fall or on the Principle of Creation, when you come to the part where you should touch the heart of listeners, you should use moving words. When you express pleasure, you should say, "Wow, it is so nice," and your facial expressions should be in tune, but if you say, "Wow, it is so nice," without any expressions, then... Everything has to be in tune internally and externally.

According to how much one understands the Principle and how many times one gives the lectures, one's power and skills will improve. Thus, you should keep this in your mind and make plans for memorizing the whole Principle book. First, you should memorize the whole thing. You should memorize at least one page a day. Then, you can memorize the whole thing within a year. However, you have not been doing this. The problem lies in that you do not carry this out. (54-182)

When you study the Principle lectures, I think it would be better if you train yourself by practicing one section at a time. Otherwise, if you have the mind-set to study the whole thing at once from the Principle of Creation to the Fall and the Principle of Restoration, it would be very difficult to lecture. As you give lectures, if you spend three months in one section, for example, on the Principle of Creation, then you will become an expert in that topic.

Based on my experience, if you train yourself in that fashion, then within one-and-a-half years, you should be able to lecture the Principle perfectly. In other words, you should not even think about doing it from the beginning to the end at once. Anyone can give lectures. You should completely abandon the thought that you cannot lecture.

If you look at the original edition of the Divine Principle book, it is altogether 556 pages. If you can just memorize one sheet a day, since it is 278 sheets altogether you can complete it within a year. (54-174)

I have told you about it too, right? A smart person can memorize the Divine Principle book from page 1 to page 556 within six months, and if you can memorize it you will be able to go anywhere in the world and not starve there but have a way to support your wife and educate your children. Can you remember when I told you about it? (126-65)

Didn't I tell you to lecture continuously? You should memorize the whole Divine Principle book. What is there that a young person cannot accomplish. This is how it is even now. If you cannot lecture well, you can never become successful. (170-316)