Source: The Christian Agnostic (1965), p.77-78, (Paul Tillich: The Shaking of the Foundations. 1963. Pelican Books. p. 164
“We feel and experience ourselves to be eternal.”
Part V, Prop. XXIII, Scholium
Variant: We feel and know that we are eternal.
Source: Ethics (1677)
Original
Sentimus experimurque, nos aeternos esse.
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Baruch Spinoza 210
Dutch philosopher 1632–1677Related quotes

“Every day we are changing, every day we are dying, and yet we fancy ourselves eternal.”
Quotidie morimur, quotidie commutamur, et tamen aternos nos esse credimus.
Letter 60; Translated by W.H. Fremantle, G. Lewis and W.G. Martley. From Nicene and Post-Nicene Fathers, Second Series, Vol. 6. Edited by Philip Schaff and Henry Wace. (Buffalo, NY: Christian Literature Publishing Co., 1893.) Revised and edited for New Advent by Kevin Knight. http://www.newadvent.org/fathers/3001.htm
Letters

“Long ago we conquered our passions
Looking at ourselves in the mirror of eternity.”
"Prayer," p. 47
The Shape (2000), Sequence: “Pit of the Stone”

“Today's today. Tomorrow we may be
ourselves gone down the drain of Eternity.”
Source: Alcestis (438 BC), l. 788
Source: Abba's Child: The Cry of the Heart for Intimate Belonging

Interview with Jennifer Rycenga (2 November 1988)

Postscript
1900s, The Varieties of Religious Experience (1902)
Context: The ideal power with which we feel ourselves in connection, the 'God' of ordinary men, is, both by ordinary men and by philosophers, endowed with certain of those metaphysical attributes which in the lecture on philosophy I treated with such disrespect. He is assumed as a matter of course to be 'one and only,' and to be 'infinite'; and the notion of many finite gods is one which hardly any one thinks it worth while to consider, and still less to uphold. Nevertheless, in the interests of intellectual clearness, I feel bound to say that religious experience, as we have studied it, cannot be cited as unequivocally supporting the infinitist belief. The only thing that it unequivocally testifies to is that we can experience union with something larger than ourselves and in that union find our greatest peace. Philosophy, with its passion for unity, and mysticism with its monoideistic bent, both 'pass to the limit' and identify the something with a unique God who is the all-inclusive soul of the world. Popular opinion, respectful to their authority, follows the example which they set.

There There (2018)
Source: As quoted in [Buchanan, Rowan Hisayo, There There by Tommy Orange review – Native American stories, https://www.theguardian.com/books/2018/jul/18/there-there-tommy-orange-review, 9 August 2018, The Guardian, July 18, 2018]