“Credo quia absurdum – I believe because it is absurd.”

Source: Around the Day in Eighty Worlds

Sebban Balwer
(15 October 1994)
Source: Lord of Chaos

Variant translations
It is by all means to be believed, because it is absurd.
It is is entirely credible, because it is inept.
It is certain because it is impossible.
De Carne Christi 5.4
Often paraphrased or misquoted as "Credo quia absurdum."
Also paraphrased as "It is so extraordinary that it must be true."
Two lines from De Carne Christi have often become conflated into the statement: "Credo quia impossibile" (I believe it because it is impossible), which can be perceived as a distortion of the actual arguments that Tertullian was making.

Social Sciences as Sorcery (1972)

Source: "Quotes", Notebooks and Lectures on the Bible and Other Religious Texts (2003), p. 209

15 July 1944; Variant translations:
It's really a wonder that I haven't dropped all my ideals, because they seem so absurd and impossible to carry out. Yet I keep them, because in spite of everything I still believe that people are really good at heart.
I keep my ideals, because in spite of everything I still believe that people are really good at heart.
I simply can't build my hopes on a foundation of confusion, misery, and death...and yet...I think...this cruelty will end, and that peace and tranquility will return again.
Source: The Diary of a Young Girl (1942 - 1944)
Context: It's difficult in times like these: ideals, dreams and cherished hopes rise within us, only to be crushed by grim reality. It's a wonder I haven't abandoned all my ideals, they seem so absurd and impractical. Yet I cling to them because I still believe, in spite of everything, that people are truly good at heart. It's utterly impossible for me to build my life on a foundation of chaos, suffering and death. I see the world being slowly transformed into a wilderness, I hear the approaching thunder that, one day, will destroy us too, I feel the suffering of millions. And yet, when I look up at the sky, I somehow feel that everything will change for the better, that this cruelty too shall end, that peace and tranquility will return once more. In the meantime, I must hold on to my ideals. Perhaps the day will come when I'll be able to realize them!

Source: The Rebel (1951), pp. 8 - 10 as quoted in Albert Camus and the Philosophy of the Absurd';(2002) by Avi Sagi, p. 44
Context: The absurd … is an experience to be lived through, a point of departure, the equivalent, in existence of Descartes' methodical doubt. Absurdism, like methodical doubt, has wiped the slate clean. It leaves us in a blind alley. But, like methodical doubt, it can, by returning upon itself, open up a new field of investigation, and in the process of reasoning then pursues the same course. I proclaim that I believe in nothing and that everything is absurd, but I cannot doubt the validity of my proclamation and I must at least believe in my protest. The first and only evidence that is supplied me, within the terms of the absurdist experience, is rebellion … Rebellion is born of the spectacle of irrationality, confronted with an unjust and incomprehensible condition.

“A Note on Poetry”, p. 50
Kipling, Auden & Co: Essays and Reviews 1935-1964 (1980)

"The Three Fish" Ch. 18 : The Three Fish, p. 196
Disputed, The Essential Rumi (1995)