Actually, KC can be based simply on hearing, chanting, remembering, etc. Described in the Srimad-Bhagavatam are nine different processes, besides which everything done is unfavorable to KC. Thus, one should always be guarding against falldowns: 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.