You can either read something many times in order to be assured that you got it all, or else you can define your purpose and use techniques which will assure that you have met it and gotten what you need
Following Korzybski , I put things in probabilities, not absolutes. . . My only originality lies in applying this zetetic attitude outside the hardest of the hard sciences, physics , to softer sciences and then to non-sciences like politics , ideology , jury verdicts and, of course, conspiracy theory.