The Chandogya Upanishad (6.11.3) also states that although the body withers and dies when the self leaves it, the living self does not die. The Bible also explains: “While we look not at the things which are seen, but at the things which are not seen; for the things which are seen are temporal; but the things which are not seen are eternal.” (II Corinthians 4:18)
Further enlightenment is given in the Srimad-Bhagavatam (7.2.22): “The spirit soul, the living entity, has no death, for he is eternal and inexhaustible. Being free from material contamination, he can go anywhere in the material or spiritual worlds. He is fully aware and completely different from the material body, but because of being misled by misuse of his slight independence, he is obliged to accept subtle and gross bodies created by the material energy and thus be subjected to so-called material happiness and distress. Therefore, no one should lament for the passing of the spirit soul from the body.”
The eternal nature of the self is also explained in Bhagavad-Gita by Sri Krishna: “Never was there a time when I did not exist, nor you, nor all these kings; nor in the future shall any of us cease to be. As the embodied soul continually passes, in this body, from boyhood to youth to old age, the soul similarly passes into other body at death. The self-realized soul is not bewildered by such a change.” (BG 2.12-13)
“Know that which pervades the entire body is indestructible. No one is able to destroy the imperishable soul. Only the material body of the indestructible, immeasurable, and eternal living entity is subject to destruction. (BG 2.17-18) . . . For the soul there is never birth or death. Nor, having once been, does he ever cease to be. He is unborn, eternal, ever-existing, undying and primeval. He is not slain when the body is slain. (BG 2.20) . . . As a person puts on new garments, giving up old ones, similarly, the soul accepts new material bodies, giving up the old and useless ones.” (BG 2.23)
Certainly this knowledge can relieve anyone from the anxiety that comes from thinking our existence is finished at death. Spiritually, we do not die, yet, the body is used until it is no longer fit to continue. At that time, it may appear that we die, but that is not the case. The soul continues on its journey to another body according to its destiny. And if one has sincerely practiced and perfected a genuine spiritual path, then one’s next body will not be material, but can be completely spiritual.
Further descriptions of the indestructibility of the soul is explained in a way that reveals how it is beyond the influence of all material elements.
“The soul can never be cut into pieces by any weapon, nor can he be burned by fire, nor moistened by water, nor withered by the wind. This individual soul is unbreakable and insoluble, and can be neither burned nor dried. He is everlasting, all-pervading, unchangeable, immovable, and eternally the same. It is said the soul is invisible, inconceivable, immutable, and unchangeable. Knowing this, you should not grieve for the body.” (BG 2.23-25)
“Some look on the soul as amazing, some describe him as amazing, and some hear of him as amazing, while others, even after hearing about him, cannot understand him at all. O descendant of Bharata, he who dwells in the body is eternal and can never be slain. Therefore you need not grieve for any creature.” (BG 2.29-30)
Jai Shree Krishna