Just wanted to check you really meant primary source.
I don’t understand how you can learn anything then. News is off limits for you, history, sciences (unless you do the experiment yourself) as well. Math might be possible, at least you can check the proof yourself without having to travel anywhere. At least one can see the earth isn‘t flat by getting on a plane, but one has to squint a bit.
More seriously, to summarise, I don’t believe you live by this principle, you would live under a rock and I wouldn’t be chatting with you.