“Ironically enough, in the same way that fear brings to pass what one is afraid of, likewise a forced intention makes impossible what one forcibly wishes... Pleasure is, and must remain, a side-effect or by-product, and is destroyed and spoiled to the degree to which it is made a goal in itself.”

“Fear is always in relation to something; it does not exist by itself. There is fear of what happened yesterday in relation to the possibility of its repetition tomorrow; there is always a fixed point from which relationship takes place. How does fear come into this? I had pain yesterday; there is the memory of it and I do not want it again tomorrow. Thinking about the pain of yesterday, thinking which involves the memory of yesterday’s pain, projects the fear of having pain again tomorrow. So it is thought that brings about fear. Thought breeds fear; thought also cultivates pleasure. To understand fear you must also understand pleasure – they are interrelated; without understanding one you cannot understand the other. This means that one cannot say ‘I must only have pleasure and no fear’; fear is the other side of the coin which is called pleasure.”

“The fear thou art in, Sancho," said Don Quixote, "prevents thee from seeing or hearing correctly, for one of the effects of fear is to derange the senses and make things appear different from what they are; if thou art in such fear, withdraw to one side and leave me to myself, for alone I suffice to bring victory to that side to which I shall give my aid;" and so saying he gave Rocinante the spur, and putting the lance in rest, shot down the slope like a thunderbolt.”

“Human nature must be something which always remains one and the same, but which may be carried out in manifold ways.”

“Theoretical considerations require that what is to-day the object of a phobia must at one time in the past have been the source of a high degree of pleasure.”

“The force with which he wanted it both ways made him grit his teeth. What kind of fool wanted it only one way?”