Parzival — here’s the key now, this is the crisis of the story — is filled with compassion and is moved to ask, ‘What ails you, uncle?’ But immediately he thinks, ‘A knight does not ask questions.’
Campbell identifies the suppression of spontaneous compassion by social conditioning as the pivotal failure of Parzival’s quest and the root cause of the Waste Land.
, Transformations of Myth Through Time, 1990thesis