“He is an atheist who does not believe in himself.”
The old religions said that he was an atheist who did not believe in God. The new religion says that he is an atheist who does not believe in himself.
Call to the Nation
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Swami Vivekananda 261
Indian Hindu monk and phylosopher 1863–1902Related quotes

“If I convert it's because it's better that a believer dies than that an atheist does.”
Source: 2010s, 2011, Mortality (2012), p. 91.

dies slowly…
Muere lentamente quien no viaja, quien no lee,
quien no oye música,
quien no encuentra gracia en sí mismo.
Muere lentamente
quien destruye su amor propio,
quien no se deja ayudar...
Poem "Muere lentamente" (Dying Slowly), wrongly attributed to Pablo Neruda. See "Fake Pablo Neruda Poem Spreads on Internet" http://www.laht.com/article.asp?ArticleId=325275&CategoryId=14094 by Ana Mendoza, Latin American Herald Tribune (12 January 2009).
Misattributed
Source: Selected Poems

Source: Down and out in Paris and London (1933), Ch. 30
Source: Down and Out in Paris and London
Context: He was an embittered atheist (the sort of atheist who does not so much disbelieve in God as personally dislike Him), and took a sort of pleasure in thinking that human affairs would never improve. Sometimes, he said, when sleeping on the Embankment, it had consoled him to look up at Mars or Jupiter and think that there were probably Embankment sleepers there. He had a curious theory about this. Life on earth, he said, is harsh because the planet is poor in the necessities of existence. Mars, with its cold climate and scanty water, must be far poorer, and life correspondingly harsher. Whereas on earth you are merely imprisoned for stealing sixpence, on Mars you are probably boiled alive. This thought cheered Bozo, I do not know why. He was a very exceptional man.

You Can Lead an Atheist to Evidence, But You Can't Make Him Think (2009)

Ritual and Mantras: Rules without Meaning, quoted in An Introduction to Hinduism https://www.google.com/books/edition/An_Introduction_to_Hinduism/KpIWhKnYmF0C?hl=en&gbpv=1&pg=PA12 by Gavin D. Flood, p. 12.

“He who offends others, does not secure himself.”
The Notebooks of Leonardo da Vinci (1883), X Studies and Sketches for Pictures and Decorations