The Upanishads - Mandhata Global

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Chapter XVIII
The Mind and the Akasa as Symbols of Brahman
One should meditate on the mind as Brahman-this is
said with reference to the body. One should meditate on
the akasa as Brahman-this is to said with reference to the
gods. Thus both-the meditation with reference to the
body and the meditation with reference to the gods-are
being taught.
That Brahman has four feet (quarters): speech is one
foot, the prana (the nose) is one foot, the eye is one
foot, the ear is one foot-this is to said with reference to
the body. Now with reference to the gods: Agni (fire) is
one foot, Vayu (air) is one foot, Aditya (the sun) is one
foot and the quarters (disah) are one foot. This is the
twofold meditation with reference to the body and with
reference to the gods.
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Speech is, indeed, a fourth foot (quarter) of Brahman of
which the mind is a symbol. It shines and warms with
the light of fire. He who knows this shines and warms
with fame, with renown and with the radiance of
Brahman.
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