[AlexandrB]

Not to be too hippy/dippy, but it's only the average of all human knowledge expressible in language. There is plenty of knowledge not expressible this way - for example, the sequence of muscle contraction orchestrated by your brain that allows you to walk. Likewise with feelings like love, pride, etc. There are words for these things, but they're merely labels on an experience that almost all humans know but the specifics of which can't be written down using text.