Aksara Parabrahman Yoga-Bhagavad Gita Chapter 8 [Attainment of Salvation]
Krishna Said > Shaloka: 26
According to the Vedas, there are two ways of passing from this world–one in the light and one in darkness. When one passes in light, he does not come back; but when one passes in darkness, he returns.
The same description of departure and return is quoted by Acarya Baladeva Vidyabhusana from the Chandogya Upanisad. In such a way, those who are fruitive laborers and philosophical speculators from time immemorial are constantly going and coming. Actually they do not attain ultimate salvation, for they do not surrender to Krishna.