Buddhist-Meditation-Systematic-and-Practical

were absorbed into the light of his body. Biographies
giving facts are very reliable; they are not, you know,
novels. All these facts were well kept in memory by the
disciples of the various Tantric gurus in India, China,
and Tibet, and soon written down. They are not matters
we may seriously doubt.
4. What is meant by saying that the lower tantras are
"derived from the two great sutras"? (See Ch. XIII,
Part One, C.)
As we have already said, Nagarjuna opened the Iron
Tower and took out these two sutras. Some say that the
Iron Tower is a symbol of his Dharmakaya. Usually we
speak of two main sutras, the Mahavairocana Sutra
(from which comes the garbhadhatu mandala) and the
Vajrasekhara Sutra (which is the basis of the vajradhatu
mandala). The rituals and practice associated with these
two mandalas may be thought of as developments of the
sutras themselves. However, the latter are the
philosophical foundations for the yoga we have
described as belonging to the Eastern Vajrayana School.
Some sutras are connected with other Tantras but none
contain doctrines higher than these two.
The listener mentioned that there were
Prajnaparamita Tantric sutras in which she is
described as the mother of all the Buddhas.
There are other Vajrayana sutras which basically
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