"Comprehension is neither an arbitrary act nor a passive experience, but a responsible act claiming universal validity…"

"Ever since [Copernicus], writers eager to drive the lesson home have urged us [...] to abandon all sentimenta…"

"The confidence placed in physical theory owes much to its possessing the same kind of excellence from which pure geom…"

"The term 'simplicity' functions then merely as a disguise for another meaning than its own. It is used for smuggling …"

"The descriptive sciences rely on skill and connoisseurship. At all these points the act of knowing includes an apprai…"

"No sincere assertion of fact is essentially unaccompanied by feelings of intellectual satisfaction or of a persuasive…"

"In a strict usage the same symbol should never represent the act of sincerely asserting something and the content of …"

"Whitehead and Russell ... translate \vdash p imples q into the words 'it is asserted that p implies q'. But the p…"

"The correct reading of \vdash p written down by me in good faith is therefore 'I believe p', or some other words …"

"A declaratory sentence can be asserted, because it is an incomplete symbol, of indeterminate modality; while a questi…"