Quote from jack hershey:
The common source of these two sets of certain information is the mind after you have fully differentiated your mind through growth and hard rational work.
The differentiation can be handed from one person to another. Gaining the facility to use this full package takes a little time to acquire fluency.
Certainly very few people can be chosen and even fewer will do the work.
Why is guessing even on the table?
I speak Hershey, here's a working explanation:
IF you can establish what is going on up to now [in terms of price volume channels on 3 levels etc] and form a hypothesis of what must happen next in the price volume sequence AND draw up a plausible counter hypothesis with the opposite conclusion THEN at some instant one of these hypotheses will be falsified and you can trade the other with certainty.
However over time you will not need the crux of the alternative hypothesis and can be certain sooner as your mind is fully differentiated.
I guess.