Meaning -
Up let us rise on top of the sun and vast spaces, reach the abode of Indra, and, having drunk the soma sweet of ecstasy, let us be together across and over the thrice seven stages of being in evolution in the purely spiritual state of the lord’s presence as a friend. (The thrice seven are the steps of physical, mental and pychic evolutionary phases of existence in three qualitative modes of being in the process of becoming. The seven states of evolution in descending order from pure being are: mahat, Ahankara and the five elements, akasha, vayu, agni, apah and prthivi. The three qualitative modes are sattva, rajas and tamas or thought, energy and matter. Another way to explain the twenty one is: five elements, five pranic energies, five perceptive organs and five organs of volition, the twenty-first is antahkarana or psychic self. When the psychic self or the soul in the existential state wishes to rise back to the purely spiritual state, it has to cross the twenty one stages and then be in the company of Indra, the cosmic self, and even later, in the transcendental state of absolute Being, the Spirit, the Brahmic state. This is set out in detail in the Sankhya, Yoga and Vedanta philosophy.)