“Observe now with what skill, with what art, I make the biggest transition in this book. Observe: my delirium began in the presence of Virgilia; Virigilia was the great sin of my youth; there is no youth without childhood; childhood presupposes birth; and so we arrive, effortlessly, at October 20, 1805, the date of my birth.”

“I got through my childhood in a delirium of literary exaltations.”

“The belief that science proceeds from observation to theory is still so widely and so firmly held that my denial of it is often met with incredulity. I have even been suspected of being insincere- of denying what nobody in his senses would doubt.But in fact the belief that we can start with pure observation alone, without anything in the nature of a theory is absurd; as may be illustrated by the story of the man who dedicated his life to natural science, wrote down everything he could observe, and bequeathed his priceless collection of observations to the Royal Society to be used as evidence. This story should show us that though beetles may profitably be collected, observations may not.Twenty-five years ago I tried to bring home the same point to a group of physics students in Vienna by beginning a lecture with the following instructions : 'Take pencil and paper; carefully observe, and write down what you have observed!' They asked, of course, what I wanted them to observe. Clearly the instruction, 'Observe!' is absurd. (It is not even idiomatic, unless the object of the transitive verb can be taken as understood.) Observation is always selective. It needs a chosen object, a definite task, an interest, a point of view, a problem. And its description presupposes a descriptive language, with property words; it presupposes similarity and classification, which in their turn presuppose interests, points of view, and problems.”

“The day of my birth, my death began its walk. It is walking toward me, without hurrying.”

“Increase in the wealth per capita fosters democracy; but the latter, at least according to what we have been able to observe up to now, entails great destruction of wealth and even eventually dries up the sources of it. Hence it is its own grave-digger, it destroys what gave it birth.”

“We all know our dates of birth but . . . every year there is another date that we pass over without knowing what it is but it is just as important it is the other date the death date.”