The rishis of ancient India—the seers who received the revelations recorded in the scriptures—had to thoroughly purify themselves in heart, mind, and soul in order to transmit this divine wisdom without distortion or incompleteness. With sufficient purification we today can also become instruments of divine revelation.

Source: Isha Upanishad lectures (Honesdale, 1989)
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Wisdom of the Isha Upanishad