We can never answer the question, “Are you sure the principles you found are the same as the real ones of the object?” We can only answer this question by saying, “It seems it works when we apply the principles to the object and we can have our problems solved.”
And when we answer the question, “Are you sure the “facts” or “phenomena” you observed or experienced are true? Or, are you sure you didn’t get fooled by your psychological state?” We can only answer these questions the same way when we answer the principle-question.
Then, when we use our knowledge to solve problems, too much confidence means foolish. We have to leave room for possible correcting when we apply our knowledge.
So, what’s the truer facts or phenomena of the object if we can’t believe in the absolutely true ones?
The standard is the same as the one when we use to evaluate the principles of the object. If it works well when we apply the knowledge to solve our problems, we can temporarily believe it, and we should immediately doubt it when it can’t work well.
