“Observe the difference between your attitude to illusions and mine. You have to defend the religious illusion with all your might. If it becomes discredited - and indeed the threat to it is great enough - then your world collapses. There is nothing left for you but to despair of everything, of civilization and the future of mankind. From that bondage I am, we are, free. Since we are prepared to renounce a good part of our infantile wishes, we can bear it if a few of our expectations turn out to be illusions.”

“We believe that it is possible for scientific work to gain some knowledge about the reality of the world, by means of which we can increase out power and in accordance with which we can arrange our life. If this belief is an illusion, then we are in the same position as you. But science has given us evidence by its numerous and important successes that it is no illusion.”

“No, our science is no illusion. But an illusion it would be to suppose that what science cannot give us we can get elsewhere.”

“Religious doctrines … are all illusions, they do not admit of proof, and no one can be compelled to consider them as true or to believe in them.”

“Religion is an illusion and it derives its strength from the fact that it falls in with our instinctual desires.”

“Religion is a system of wishful illusions together with a disavowal of reality, such as we find nowhere else but in a state of blissful hallucinatory confusion. Religion's eleventh commandment is "Thou shalt not question.”

“Thus I must contradict you when you go on to argue that men are completely unable to do without the consolation of the religious illusion, that without it they could not bear the troubles of life and the cruelties of reality. That is true, certainly, of the men into whom you have instilled the sweet -- or bitter-sweet -- poison from childhood onwards. But what of the other men, who have been sensibly brought up? Perhaps those who do not suffer from the neurosis will need no intoxicant to deaden it. They will, it is true, find themselves in a difficult situation. They will have to admit to themselves the full extent of their helplessness and their insignificance in the machinery of the universe; they can no longer be the centre of creation, no longer the object of tender care on the part of a beneficent Providence. They will be in the same position as a child who has left the parental house where he was so warm and comfortable. But surely infantilism is destined to be surmounted. Men cannot remain children for ever; they must in the end go out into 'hostile life'. We may call this 'education to reality. Need I confess to you that the whole purpose of my book is to point out the necessity for this forward step?”