“Propaganda does not deceive people; it merely helps them to deceive themselves.”

Fourth Lecture, p. 70.
The Psychology of Man's Possible Evolution (1950)
Context: People who think they can control their negative emotions and manifest them when they want to, simply deceive themselves. Negative emotions depend on identification; if identification is destroyed in some particular case, they disappear. The strangest and most fantastic fact about negative emotions is that people actually worship them. I think that, for an ordinary mechanical man, the most difficult thing to realise is that his own and other people's negative emotions, have no value whatever and do not contain anything noble, anything beautiful or anything strong. In reality negative emotions contain nothing but weakness and very often the beginning of hysteria, insanity or crime. The only good thing about them is that, being quite useless and artificially created by imagination and identification, they can be destroyed without any loss. And this is the only chance of escape that man has.

In the Belly of the Beast (1981)

L'espérance fait plus de dupes que l'habileté.
Bartlett's Familiar Quotations, 10th ed. (1919)

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)

Source: Resurrection (1899), Ch. 28

The Nemesis of Faith (1849)

Source: That Hideous Strength (1945), Ch. 13 : They Have Pulled Down Deep Heaven on Their Heads

The First Year of Life of the Child (1927), "The Egocentrism of the Child and the Solipsism of the Baby", as translated by Howard E. Gruber and J. Jacques Vonèche
Context: There are no really solipsistic philosophers, and those who think they are deceive themselves. The true solipsist feels at one with the universe, and so very identical to it that he does not even feel the need for two terms. The true solipsist projects all his states of mind onto things. The true solipsist is entirely alone in the world, that is, he has no notion of anything exterior to himself. In other words the true solipsist has no idea of self. There is no self: there is the world. It is in this sense it is reasonable to call a baby a solipsist: the feelings and desires of a baby know no limits since they are a part of everything he sees, touches, and perceives.
Babies are, then, obviously narcissistic, but not in the way adults are, not even Spinoza's God, and I am a little afraid that Freud sometimes forgets that the narcissistic baby has no sense of self.
Given this definition of solipsism, egocentrism in children clearly appears to be a simple continuation of solipsism in infants.. Egocentrism, as we have seen, is not an intentional or even a conscious process. A child has no idea that he is egocentric. He believes everybody thinks the way he does, and this false universality is due simply to an absence of the sense of limits on his individuality. In this light, egocentrism and solipsism are quite comparable: both stem from the absence or the weakness of the sense of self.