Ab Uno Disce Omnes
From one learn to know all.
To cognize any is to cognize all.
In order to know any fact, all contingencies of such fact must also be known. Otherwise, such fact is neither completely nor certainly "known" per se. This is implausible, if not wholly impossible, to argue against in any reasonable context. History is a list replete with rational and logical errors (hopefully) supplanted by less error in thought and its reflection. Given the glaring fact of there not being any perfect textbook, yet anyway, it is entirely probable that, in fact, we really "know" nothing at all, consciously.
(Subconsciously, we may be universally aware of everything in the same manner as everything is universally aware and intercommunicating amid the phenomenal milieu of fact being connected by electromagnetic radiation and the forces of nature. Awash in data and information, subconsciously we could know everything, but this could stand in sharp, stark contrast to how much we know consciously. If our college textbooks are any indication of what we "know", because there are no perfect textbooks, i.e. textbooks without any need for revision, we have no certain conscious knowledge of anything.)
This reveals telling inferiority inherent in conscious fact, which is always information, or poor fact. Pure fact, or data, is superior fact, but we are aware of such pure fact only in that realm of the mind which is inclusive, i.e. the subconscious, subliminal mind as opposed to the exclusive domain of the conscious mind. The exclusive conscious mind is primarily concerned with focus of thought, keeping one idea upon which concentration remains centered at the exclusion, sometimes overt ignorance, of all other thought.
So, while the conscious mind primarily excludes other, interfering thought, the subconscious mind is incapable of such mental filtration, and, as a possibly astounding result, it is entirely plausible that we do subliminally really know everything.
Data are everywhere, and all things are connected to all other things in a milieu of phenomena and epiphenomena saturated with pure fact. It only transforms into information through the attenuation of conscious thought. As a result, we ironically become prisoners of fact rather than its masters.
(While fact theory implicitly predicts its own error, just how amusing should be such prediction as its only substantially significant error?)
The best facts are plain, and among the plainest of these is that in order for any fact to be "known", per se, all contingencies of that fact must be also be known in order for a fact to really be fully known and understood absolutely. Otherwise, a (relative) fact incompletely known is merely fractionally known, and not known or cognized totally. This fact alone should honestly temper and humble our judgments about and of each other, particularly as must rationally and logically regard “reasonable doubt”.
The quality of fact varies across a full spectrum all the way from pure fact, or data, through poor fact, or information. Fortunately, it is quite safe to guess that there are nearly infinitely more data available in the universe than there is information. Unfortunately, in current events among humans, we are continually bathed and utterly saturated in the poor facts of mere information, the predominant medium of the conscious mind and mentality.