“All men's souls are immortal, but the souls of the righteous are immortal and divine.”
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Socrates 168
classical Greek Athenian philosopher -470–-399 BCRelated quotes

“I believe in the immortality of the soul because I have within me immortal longings.”
Source: To Love This Life: Quotations By Helen Keller

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.

“The Theophilanthropists believe in the existence of God, and the immortality of the soul.”
1790s, Discourse to the Theophilanthropists (1798)

“Know that my soul is immortal. Know this for yourself”
Saying stated to his disciples

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

“Plato affirmed that the soul was immortal and clothed in many bodies successively.”
Plato, 40.
The Lives and Opinions of Eminent Philosophers (c. 200 A.D.), Book 3: Plato