May glory come to both of us (teacher and pupil) together! May Vedic light belong to both of us! Now let us explain the Upanishad (the secret meaning) of the union (samhita), under five heads, with regard to the worlds, the heavenly lights, knowledge, offspring, and self (body). People call these the great Samhitas. First, with regard to the worlds. The earth is the former element, heaven the latter, ether their union;