Mandala means circle. The Rig Ved has 10 Mandala's, 10 books of pure knowledge. The 1st 8 mandala's provides knowledge of the Cosmic mind (1), Intellect (2)and Ego (3) and the 5 senses.
Reading and listening to the 9th mandala enlivens the highest form of Energy, Soma, in one self, in one's Consciousness.
Reading and listening to the 10th mandala enlivens Unity, Wholeness and totality in one's Consciousness.
The following verses are from the final chapter of the 10th Mandala, X.12.40:
Meet together, talk together, let your minds apprehend alike;
in like manner as the ancient gods concurring accepted their portion of the sacrifice.
Common be the prayer of these assembled worshipers,
Common be the acquirement,
Common the purpose, associated be the desire.
I repeat for you a common prayer,
I offer for you with a common oblation.
Common worshipers, be your intention;
Common be the wishes of your hearts;
Common be your thoughts, so that there may be thorough union among you.
End of the Tenth Mandala.