In order to confirm truths, you absolutely need to formulate concrete, realistic (factual) problems/questions. And then you need to put those questions on the principle and check their result in reality.

That there is something I learned from that man and is the answer to your question. The question now is whether you can understand, accept, and practice it.

If you can practice the above fact and you are able to ask real questions, you will realize every truth and obtain everything you want.

If you cannot, you will quickly change into a worse person as your decision there causes you to form a relationship in your consciousness with having discarded the most important opportunity in your life despite believing the lie that you did the right thing – and that relationship which comes to stay within your consciousness will continue to affect your life, causing you to repeat the same thing continuously.

By the way, everything he teaches indicates "don't believe what people say. don't believe your own thoughts. don't believe what you think you understood from me. confirm everything for yourself and don't believe it until after confirmation." He even says that very clearly in a few places.

Regardless of the fact that he was one man observing the things he observed, the source of his truth is facts, not his own words, thoughts, or ideas – which he never told others. If you checked before believing your thoughts about him, you would have been able to notice that.

As you said you are interested in truth, rather than wanting something else out of him like how to be successful, I will tell you one thing. If you have a lie in your consciousness – which you invariably believe without your realization – you will not be able to understand his words correctly at all. The reason is that things which lie latent in your consciousness combined with your ignorance of the matter will interfere with your ability to perceive the definitions of the words and cause you to reject what you didn't understand before you can confirm. So it's not possible to be able to learn things just by your own thoughts. It requires that you first abandon your existing knowledge and secondly confirm the facts.

So if you are actually interested (and you can confirm that you are interested instead of it being the narrative that you feel best telling yourself) and you put in a little effort you can confirm everything he says. He taught that when we tell others something that we haven't confirmed and which they can't realize/confirm, it becomes lying. And I challenge you to find even a single lie in anything he said. If you can I will give you everything of mine, including my head, if you would like, and I will not follow him anymore.

He traveled over 50 countries and met thousands upon thousands of extremely smart, top intellectuals, politicians, scientists, religious/spiritual leaders, etc. He confirmed his truth through his encounters with them and through their own knowledge and information. No one could answer his 10 questions but he was never unable to answer even a single person's questions. It would be a very silly mistake for you to think you know that there's just "one source" there.

Besides, I learned from him and I'm a great proof that I have obtained enough ability to not be defeated in debate by anyone alive today. Go ahead and ask me the hardest questions you want to – I will give you the correct, verifiable answer. Meanwhile I can ask you any number of questions and I know you won't be able to answer them. Like I said above, I am willing to bet my life. So I would advise you to re-check before you let yourself accept your initial assumption that you understood the situation correctly.