Source: Dictionary of Burning Words of Brilliant Writers (1895), p. 31.
Context: I cannot look around me without being struck with the analogy observable in the works of God. I find the Bible written in the style of His other books of Creation and Providence. The pen seems in the same hand. I see it, indeed, write at times mysteriously in each of these books; thus I know that mystery in the works of God is only another name for my ignorance. The moment, therefore, that I become humble, all becomes right.
“I will explain therefore how, studying in the silence of my heart, and far from every human consideration, the mystery of social revolutions, God, the great unknown, has become for me an hypothesis, — I mean a necessary dialectical tool.”
Introduction
The Philosophy of Misery (1846)
Context: Tormented by conflicting feelings, I appealed to reason; and it is reason which, amid so many dogmatic contradictions, now forces the hypothesis upon me. A priori dogmatism, applying itself to God, has proved fruitless: who knows whither the hypothesis, in its turn, will lead us?
I will explain therefore how, studying in the silence of my heart, and far from every human consideration, the mystery of social revolutions, God, the great unknown, has become for me an hypothesis, — I mean a necessary dialectical tool.
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Pierre Joseph Proudhon 40
French politician, mutualist philosopher, economist, and so… 1809–1865Related quotes

Das Maschinenwerk der Revolutionen irret mich also nicht mehr: es ist unserm Geschlecht so nötig, wie dem Strom seine Wogen, damit er nicht ein stehender Sumpf werde. Immer verjüngt in neuen Gestalten, blüht der Genius der Humanität.
Vol. 1, p. 294; translation vol. 1, p. 416
Ideen zur Philosophie der Geschichte der Menschheit (1784-91)
The Power of Silence: Against the Dictatorship of Noise (2017)

“Study is the child of silence and mystery.”
Source: The Bohemians of the Latin Quarter: Scenes de la Vie de Boheme

1946 - 1963, interview with John Richardson' (1957)

Undated letter indicating that, at least at times, Mother Teresa's theological doubts were strong enough to be regarded as Christian atheism, reported by Time (9 March 2007) http://time.com/4126238/mother-teresas-crisis-of-faith/,and quoted in "Was Mother Teresa an atheist?", in The Guardian (24 August 2007) http://www.theguardian.com/commentisfree/2007/aug/24/wasmotherteresaanatheist
2000s
Context: Lord, my God, who am I that You should forsake me? The Child of your Love–and now become as the most hated one–the one–You have thrown away as unwanted–unloved. I call, I cling, I want–and there is no One to answer–no One on Whom I can cling–no, No One.–Alone … Where is my Faith–even deep down right in there is nothing, but emptiness & darkness–My God–how painful is this unknown pain–I have no Faith–I dare not utter the words & thoughts that crowd in my heart–& make me suffer untold agony. So many unanswered questions live within me afraid to uncover them–because of the blasphemy–If there be God –please forgive me–When I try to raise my thoughts to Heaven–there is such convicting emptiness that those very thoughts return like sharp knives & hurt my very soul.–I am told God loves me–and yet the reality of darkness & coldness & emptiness is so great that nothing touches my soul. Did I make a mistake in surrendering blindly to the Call of the Sacred Heart?

Source: Women's Liberation and the African Freedom Struggle

Solidarity in Liberty: The Workers' Path to Freedom (1867)
Context: What all other men are is of the greatest importance to me. However independent I may imagine myself to be, however far removed I may appear from mundane considerations by my social status, I am enslaved to the misery of the meanest member of society. The outcast is my daily menace. Whether I am Pope, Czar, Emperor, or even Prime Minister, I am always the creature of their circumstance, the conscious product of their ignorance, want and clamoring. They are in slavery, and I, the superior one, am enslaved in consequence.

On how his childhood experiences shaped his writings in “In the Author’s Universe: Interview with Sci-Fi Author Cixin Liu” https://vocal.media/futurism/in-the-authors-universe-interview-with-sci-fi-author-cixin-liu in Vocal (2016)