This hymn is a great mystery. It formerly lived in the breast of Brahinan the Creator. Branman gave it to Shakra. Shakra gave it to Death.
एतद् रहस्यं परमं ब्रह्मणो हृदि संस्थितम्। ब्रह्मा प्रोवाच शक्राय शक्रः प्रोवाच मृत्यवे॥