“Chârvâkas, a very ancient sect in India, were rank materialists. They have died out now, and most of their books are lost. They claimed that the soul, being the product of the body and its forces, died with it; that there was no proof of its further existence. They denied inferential knowledge accepting only perception by the senses.”

Source: quoted in Londhe, S. (2008). A tribute to Hinduism: Thoughts and wisdom spanning continents and time about India and her culture https://books.google.com/books/about/A_Tribute_to_Hinduism.html?id=G3AMAQAAMAAJ

Creo que son los males del alma, el alma. Porque el alma que se cura de sus males, muere.
Voces (1943)

Journal entry (7 October 1965) as published in No Souvenirs (1977) later retitled Journal II, 1957-1969 (1989), p. 269.

Source: Introduction to The Closing of the American Mind (1988), pp. 16-17
Context: In the greatest confusion there is still an open channel to the soul. It may be difficult to find because by midlife it is overgrown, and some of the wildest thickets that surround it grow out of what we describe as our education. But the channel is always there, and it is our business to keep it open, to have access to the deepest part of ourselves—to that part of us which is conscious. … The independence of this consciousness, which has the strength to be immune to the noise of history and the distractions of our immediate surroundings, is what the life struggle is all about. The soul has to find and hold its ground against hostile forces, sometimes embodied in ideas which frequently deny its very existence, and which indeed often seem to be trying to annul it altogether.

Sun-being to Cyrano
The Other World (1657)

(1964) Fada’ih al-Batiniyya. Edited by Abdurahman Badawi. Kuwait: Muasassa Dar al-Kutub al-Thiqafa, p. 82.

Meditations. Yogas, Gods, Religions (2000)

Source: The Professor at the Breakfast Table (1859), Ch. XI.