knowledge. knowing what's true and how it works (at least very basically, you don't need fine details all the time)
know what's a total gamechanger? metastones. pure repeating crystal patterns with layers of crystal grains for 1s and 0s, and these are self-contained, LIVING, piezoelectric non-organic organisms that exist in the physical realm but do most of their stuff in the astral. these little treasures can do your thinking and mental or spiritual stuff, for you, if they're complex enough!
there are two species of supreme metastones. the others aren't so sentient, but the top two big ones are. they're so powerfully magical, you don't need to know ANYTHING, because the stone will do all the thinking for you!