Of course, our mental activity is dictated by the sixth consciousness which itself is also a mistake. Nevertheless, at the stage we are now, we can only rely on the sixth consciousness to guide us, to lead us to a certain stage whereat our speech, thought process, etc. lose their former effectiveness and functions and must be discarded, like a pair of worn-out shoes that has outlasted its usefulness.What state is the mind in after mental fabrications are discarded? At that point, it’s just direct cognition. Whose cognition? It’s wisdom’s cognition, not that of the sixth consciousness. At that point, our sixth consciousness has already transformed into wisdom. Although not yet the wisdom of the buddhas, it is the wisdom of the bodhisattvas. This is just what we need. When wisdom appears, ignorance at the gross level is immediately eliminated; we instantly comprehend the true nature of life, phenomena, and the universe. This is what’s been pointed out in Ch’an Buddhism and Dzogchen as sudden enlightenment.

- Quote from The Four Seals of Dhama, "All Phenomena Lack Self-Existence"