The long hard search for the soul asks too much endurance of self-discipline from its pursuers ever to be more than it has been in the past--an undertaking for the few driven by an inner urge. Hence it is not so much a voluntary undertaking as an involuntary one. The questers cannot help themselves. It is not that they necessarily have the strength to endure as that they have no choice except to endure.
-- Notebooks Category 1: Overview of the Quest > Chapter 2: Its Choice > # 262