The Great Epic of the Bhārata dynasty 6.24.15

6.24.15

yaṃ hi na vyathayantyete puruṣaṃ puruṣarṣabha |
samaduḥkhasukhaṃ dhīraṃ so'mṛtatvāya kalpate || 15 ||

"The Holy One said,--'Thou mournest those that deserve not to be mourned. Thou speakest also the words of the (so-called) wise. Those, however, that are (really) wise, grieve neither for the dead nor for the living. It is not that, I or you or those rulers of men never were, or that all of us shall not hereafter be. Of an Embodied being, as childhood, youth, and, decrepitude are in this body, so (also) is the acquisition of another body. The man, who is wise, is never deluded in this. The contacts of the senses with their (respective) objects producing (sensations of) heat and cold, pleasure and pain, are not permanent, having (as they do) a beginning and an end. Do thou. O Bharata, endure them. For the man whom these afflict not, O bull among men, who is the same in pain and pleasure and who is firm in mind, is fit for emancipation. There is no (objective) existence of anything that is distinct from the soul; nor non-existence of anything possessing the virtues of the soul. This conclusion in respect of both these hath been arrived at by those that know the truths (of things). Know that [the soul] to be immortal by which all this [universe] is pervaded. No one can compass the destruction of that which is imperishable. It hath been said that those bodies of the Embodied (soul) which is eternal, indestructible and infinite, have an end. Do thou, therefore, fight, O Bharata.