"Mere numbers cannot bring out... the intimate essence of the experiment. This conviction comes naturally when one wat…"

"It seems to me that people of talent and of genius serve better than average examples for making us understand the la…"

"I wish that people would be persuaded that psychological experiments, especially those on the complex functions, are …"

"Since we seek to know what is the physical phenomenon we perceive, we must first enunciate this proposition, which wi…"

"This observation might be repeated with regard to all objects of the outer world which enter into relation with us. W…"

"I believe it has required a long series of accepted observations for us to have arrived at this idea, now so natural …"

"When we attempt to understand the inmost nature of the outer world, we stand before it as before absolute darkness. T…"

"The world is but an assembly of present, past, and possible sensations; the affair of science is to analyze and co-or…"

"We are, for the rest, so wrapped up in sensations that none of our boldest conceptions can break through the circle."

"The mechanical conception of the universe is nothing but naïve realism."