“The soul is in the very likeness of the divine, and immortal, and intelligible, and uniform, and indissoluble, and unchangeable; and the body is in the very likeness of the human, and mortal, and unintelligible, and multiform, and dissoluble, and changeable.”
Plato, Phaedo
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Socrates 168
classical Greek Athenian philosopher -470–-399 BCRelated quotes

Source Book in Ancient Philosophy (1907), The Golden Sayings of Democritus

“All men's souls are immortal, but the souls of the righteous are immortal and divine.”

The Tragic Sense of Life (1913), III : The Hunger of Immortality
Context: I am dreaming...? Let me dream, if this dream is my life. Do not awaken me from it. I believe in the immortal origin of this yearning for immortality, which is the very substance of my soul. But do I really believe in it...? And wherefore do you want to be immortal? you ask me, wherefore? Frankly, I do not understand the question, for it is to ask the reason of the reason, the end of the end, the principle of the principle.

Theorie und Praxis sind Eins wie Seele und Leib, und wie Seele und Leib liegen sie großenteils mit einander in Streit.
Source: Aphorisms (1880/1893), p. 59.

“Friendship, like the immortality of the soul, is too good to be believed.”

“No mortal ever has been, no mortal ever will be like the soul just launched on the sea of life.”
Solitude of Self (1892)

“The soul of wit may become the very body of untruth.”
Foreward (p. vii)
Brave New World Revisited (1958)