When I was in Dr. Tong's Seminary, I bought the Audio CDs of all the lectures as well. Not because I want some kind of proof or am obsessed about the materials, but because Dr. Tong's lectures were so intensive that I couldn't grasp all of them by just attending it. I had to have some kind of recording. Writing notes would waste the time and money of attending. Because when I attended, I wanted to see his character, expressions, in every lectures, observing his every speech, visual expressions, etc. I have long studied these human behaviors to know certain things most people would normally ignore, or misinterpret.
It is to my understanding that the benefit of self-study in certain things actually does give one insight to certain things that is not publicly available. When such insights are shared, the academy is advanced. However, if such insights are false, they are usually coming out of pride, and should be discussed rather than being shared as some kind of achievement.
So by just observing Dr. Tong's lectures, there are too much to absorb. Due to the fact that he has truly put his entire life, effort and energy to glorify God, and therefore God has blessed him with all the experiences, knowledge and wisdom to share with us.
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