The limitation of the Long Path is that it is concerned only with thinning down, weakening, and reducing the ego's strength. It is not concerned with totally deflating the ego. Since this can be done only by studying the ego's nature metaphysically, seeing its falsity, and recognizing its illusoriness, which is not even done by the Short Path, then all the endeavours of the Short Path to practise self-identification with the Overself are merely using imagination and suggestion to create a new mental state that, while imitating the Overself's state, does not actually transcend the ego-mind but exists within it still. So a third phase becomes necessary, the phase of getting rid of the ego altogether; this can be done only by the final dissolving operation of Grace, which the man has to request and to which he has to give his consent. To summarize the entire process, the Long Path leads to the Short Path, and the Short Path leads to the Grace of an unbroken egoless consciousness.
-- Notebooks Category 23: Advanced Contemplation > Chapter 5: Balancing the Paths > # 206
-- Perspectives > Chapter 23: Advanced Contemplation > # 3