We should receive knowledge by the bona fide, parampara system. Otherwise it may be bogus. Because without parampara system, we cannot understand actual fact. And we have to become in the disciplic succession. We must accept a guru: Revision history
Diff selection: Mark the radio buttons of the revisions to compare and hit enter or the button at the bottom.
Legend: (cur) = difference with latest revision, (prev) = difference with preceding revision, m = minor edit.