This quote tells me that every information that we need to have can be obtained through observation. I agree with this to a certain degree. As an autodidact person I have experience many times in my life that I can obtain information on my own just fine and I don’t need anyone to explain it to me as long as I have the time and energy to analize it for myself I will eventually connect the dots. As far as I know that was the original method of obtaining information before any kind of formal education systems appared. There were times before the establishment of the first universities when people already mastered (not neccesseraly by modern standards) different professions through observation. Another interpretation of this quote can be the fact that nothing is as educational and convincing to a person than what she experiences for herself hence observation is the best way to learn.