You can be persuaded of something by reason and argument so that an enduring change in perspective is achieved but this is far short of seeing something true as a result of a pointing (which can originate internally or externally.) The latter can only happen once and only at a fortunate moment, and yet the one who 'sees' is always awake and always free to turn towards the indicated truth. What makes the event so rare is the coincidence of ripeness and perfect disinterest, and of these it is the perfection of disinterest that is the more out of the ordinary. Reason can assist with ripeness but at the cost of introducing a motivation, of wanting something for the sake of something else or because of something else. The form of reasoning, its appearance of impartiality, which becomes an idol of the mind, obscures this.