“The human race has only two unlimited capacities: one for suffering and one for lying. I want to fight religion as the root of all human lying and the only excuse for human suffering.”
Journals of Ayn Rand (1997)
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Ayn Rand 322
Russian-American novelist and philosopher 1905–1982Related quotes

“The human race has only one really effective weapon and that is laughter.”
“Humanity has only one religion, state, cast, and colour, which teaches us every human is equal.”
LINK BUILDING FOR SEO: The Definitive Guide Oxford University Press, (May 16, 2019), ISBN-10: 1099305861, ISBN-13: 978-1099305863

“The human capacity for eternal transformation is the antidote to unbearable suffering and tragedy.”
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Falsehood in Wartime (1928), Introduction
Context: Lying, as we all know, does not take place only in war-time. Man, it has been said, is not "a veridical animal," but his habit of lying is not nearly so extraordinary as his amazing readiness to believe. It is, indeed, because of human credulity that lies flourish. But in war-time the authoritative organization of lying is not sufficiently recognized. The deception of whole peoples is not a matter which can be lightly regarded.
A useful purpose can therefore be served in the interval of so-called peace by a warning which people can examine with dispassionate calm, that the authorities in each country do, and indeed must, resort to this practice in order, first, to justify themselves by depicting the enemy as an undiluted criminal; and secondly, to inflame popular passion sufficiently to secure recruits for the continuance of the struggle. They cannot afford to tell the truth. In some cases it must be admitted that at the moment they do not know what the truth is.

[Thus Spake the Holy Mother, 72-73]
Humanity
Source: The Teachings of Babaji, 23 September 1983

“The only certainty in war is human suffering, uncertain costs, unintended consequences.”
Remarks by the President on the Iran Nuclear Deal at American University in Washington, D.C. (August 05, 2015) https://www.whitehouse.gov/the-press-office/2015/08/05/remarks-president-iran-nuclear-deal
2015