(Since the last time I quoted the OED it was met with little acknowledgment I'll use the American Heritage Dictionary, 4th edition, copyright 2009)
"Absolute--free from imperfection; complete; perfect. Root of word-- first used: 1350–1400; Middle English < Latin origin: absolūtus, meaning free, unrestricted, unconditioned (ptp. of absolvere to absolve), equiv. to ab- ab- + solū- loosen + -tus ptp. suffix or Latin definitions: Ab-- from or away from. Solu-- to loosen." So it is to be away from the loose (or things that move).
To be an absolute an idea, thought, concept, fact or anything, must be intrinsic to all with cognitive thought. The essence of an absolute invokes the idea that whatever it is, it must exists outside or above all rebuke.
"To the best of knowledge" would indicate an individual's base cognitive thought embraces the fluidity of life, the ever-changing aspects of existence. What was true yesterday is not true today. "To know" makes one stagnant and unmovable, instantly archaic and past (if even for a moment).
All that is thought is abstract because it cannot be shared absolutely. Even if something is agreed upon, it is still the ownership of an individual perception--shaped, interpreted, and conceptualized by the individual. To disagree would simply prove my point, because we are coming to a single point in different directions.
Thus marinealways24 remains a prophet, since I a have yet to see anyone refute him without trying to call upon previously "set" personal beliefs.