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The soul, from the perspective of yoga, is eternal in its essence (dravya) but changes in its modifications (paryaya). Just like the ocean doesn't change, only the waves do, similarly, the soul remains the same, only its states change. The remembrance of the three states of childhood, youth, and old age, all experienced by the same soul, clearly indicates the soul's eternal nature. Just as a person discards old clothes and wears new ones, the soul sheds its worn-out body and takes on a new one. The body changes, but the soul remains unchanged. Therefore, knowing that the soul is imperishable, immortal, and indestructible, you should be free from fear.
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“The soul is eternal in its essence (dravya), but changes in its modifications (paryaya);
The knowledge of the three states of childhood, youth, and old age, is experienced by the same soul. Or, if someone claims that knowledge is momentary,
Then the one who claims so is not momentary, as their experience proves otherwise. When does anything ever truly perish?
If consciousness perishes, then where does it merge? Investigate.”
—Srimad Rajchandra's Sri Atmasiddhi.
Furthermore, if any disciple has faith and attachment towards the body, then, in order to make them understand, one should emphasize the impermanence of the body by saying: – “Look! It is not appropriate to have faith in these impermanent bodies. This entire world is momentary. It is constantly perishing. Beloved relationships filled with jealousy and sorrow are impermanent. This is the place of evil conduct. Youth is impermanent. Wealth, born from intense suffering, is impermanent. And life, which is the cause of the destruction of all beings, is also impermanent. Repeated birth, repeated death, and repeated reliance on higher and lower states, all of this is present here, so there is no happiness here. Thus, everything in this world is inherently impermanent in its modifications (paryaya).
x " Just as one discards old clothes and wears new ones, so too does one discard old bodies and take on new ones.
Just as one does not consider oneself lost when one's clothes are lost, so too does one not consider oneself lost when one's body is lost." —Sri Pujyapada Swami's Sri Samadhishatak.
"Impermanent is the beloved union, filled with jealousy and sorrow. Impermanent is youth, and the place of evil conduct. Impermanent is wealth, born from intense suffering. Impermanent is life, the cause of the destruction of all beings. Repeated birth, repeated death, and repeated reliance on higher and lower states, all of this is present here, so there is no happiness here. Thus, everything in this world is inherently impermanent in its modifications (paryaya). Therefore, what is the point of attachment for the wise? Abandoning the world, which is worthy of worship, and the eternal stain,
Serving others, the wise, the virtuous, have done their duty." —Sri Haribhadracharya's Sri Shastravartasamuccaya, Stamak 1.