DA DA DA

Once upon a time, Gods, Men and Demons were students of Brahma (Prajapati: referred as God of thunder).

When they had finished their training, Gods asked him "tell us something that enlightens our souls".

Brahma responded saying "DA", and then asked them whether they had understood.

"We understood" they answered. "You told us DAmyata (be self controlled)."

"Yes" he said, "You understood indeed!"

Then the men asked him, he uttered the same syllable "DA", and then asked them whether they had understood.

"We understood" they answered. "You told us DAtta (give)".

"Yes" he said, "You understood indeed!"

Then the demons asked him, ... and he uttered the same syllable "DA", and then asked them whether they had understood.

"We understood" they answered. "You told us DAyadhvam (be merciful)"

"Yes" he said, "You understood indeed!"

And thus the blessed voice of thunder ever repeats DA DA DA (a traditional onomatopoeic expression of the sound of thunder) reminding us to - be self-controlled, give (charity), be merciful (mercy).

Note: Excerpt from "Brhadaranyaka Upanisad".