“I am convinced that human life is filled with many pure, happy, serene examples of insincerity, truly splendid of their kind-of people deceiving one another without (strangely enough) any wounds being inflicted, of people who seem unaware even that they are deceiving one another.”
Source: No Longer Human
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Osamu Dazai 39
Japanese author 1909–1948Related quotes

Two Ages: The Age of Revolution and the Present Age. A Literary Review. By Soren Kierkegaard, 1846 edited and translated by Howard V. Hong and Edna H. Hong 1978 Princeton University Press P. 10
1840s, Two Ages: A Literary Review (1846)

Misattributed
Source: Robert McAfee Brown https://en.wikipedia.org/wiki/Robert_McAfee_Brown. Preface for the 25th anniversary edition of Night https://en.wikipedia.org/wiki/Night_%28book%29. Page v, Bantam Books paperback; 1982 reissue edition.

2000s, The Central Idea (2006)
Context: The equality of mankind is best understood in light of a two-fold inequality. The first is the inequality of mankind and of the subhuman classes of living beings that comprise the order of nature. Dogs and horses, for example, are naturally subservient to human beings. But no human being is naturally subservient to another human being. No human being has a right to rule another without the other's consent. The second is the inequality of man and God. As God's creatures, we owe unconditional obedience to His will. By that very fact however we do not owe such obedience to anyone else. Legitimate political authority—the right of one human being to require obedience of another human being—arises only from consent. The fundamental act of consent is, as the 1780 Massachusetts Bill of Rights states, "a social compact by which the whole people covenants with each citizen and each citizen with the whole people that all shall be governed by certain laws for the common good." The "certain laws for the common good" have no other purpose but to preserve and protect the rights that each citizen possesses prior to government, rights with which he or she has been "endowed by their Creator." The rights that governments exist to secure are not the gift of government. They originate in God.

Populus Vult
The Note-Books of Samuel Butler (1912), Part XII - The Enfant Terrible of Literature

“Happiness is the perpetual possession of being well deceived.”