When the mind consciousness is absent, the manas—regardless of whether it can introspect itself—cannot be known, because without the mind consciousness, how could it be known? Take two people, A and B: whether A can introspect himself—when B is not present, how can this be judged? If B's eyes are obstructed, even when facing A directly, how can B observe and judge A's mental activities? The mind consciousness of ordinary sentient beings is just like B with obstructed eyes, unable to directly observe and judge whether the manas has any particular mental activity. Therefore, I advise ordinary sentient beings to just cultivate diligently with their heads down and prepare for personal realization; do not draw any definitive conclusions about the manas, and do not draw any definitive conclusions about the dharma of the seed-wisdom of Yogācāra—this is far, far removed from one's own actual contemplative practice (vipaśyanā-caryā) of direct perception.
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