The production of speech sounds requires certain conditions. First, the mind possesses perception and contemplation, desiring to express itself. Thus, wind touches the navel, and the breath travels along the navel, reaching the throat and tongue, causing speech sounds to emerge. The volume of the sound relates to the strength of the wind-breath, which in turn correlates with the intensity of perception and contemplation. This intensity is connected to the emotional magnitude of the Manas (mind faculty) and the Five-sense-consciousness, as well as to mental factors. In dreams, only the Alaya-consciousness, Manas, and the solitary mental consciousness are present; the Five-sense-consciousness is absent, and the body faculty is largely inactive. Although the Manas and mental consciousness possess the intention to express, speech and sound cannot be produced. Despite the absence of speech sounds, one can still comprehend what the other intends to convey, because the Manas does not require speech sounds to understand the thoughts of the other's Manas. The mental consciousness in dreams, unhindered by the physical body, possesses minor psychic powers. It can understand the other's meaning and can also ascend to heavens or descend to earth.
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