“Formerly men had belief as to the supersensuous and thought they had knowledge of the sensuous. The science of the future, while agnostic as to the supersensuous, will replace knowledge by belief in the perceptual sphere, and reserve the term knowledge for the conceptual sphere—the region of their own concepts and ideas...”

“The term knowledge raises philosophical eyebrows (strictly speaking, it should be called belief).”

“Men honor what lies within the sphere of their knowledge, but do not realize how dependent they are on what lies beyond it.”

“The more the fruits of knowledge become accessible to men, the more widespread is the decline of religious belief.”

“At last their universe had been wrecked by rays, and Karl Pearson undertook to cut the wreck loose with an axe, leaving science adrift on a sensual raft in the midst of a supersensual chaos.”

“The sensuous may be exceedingly distinct, while intellectual concepts are extremely confused. The former we observe in the prototype of sensuous knowledge geometry; the latter, in the organon of all intellectual concepts, metaphysics. It is evident how much toil the latter is expending to dispel the fogs of confusion darkening the common intellect, though not always with the happy success of the former science.”

“There is no knowledge and science like pondering and thought; and there is no prosperity and advancement like knowledge and science.”

“Belief can be manipulated. Only knowledge is dangerous.”

“What is knowledge? Ever since class society came into being the world has had only two kinds of knowledge, knowledge of the struggle of production and knowledge of the class struggle. Natural science and social science are the crystallization of these two kinds of knowledge, and philosophy is the generalization and summation of the knowledge of nature.”

“To sustain the belief that there is no God, atheism has to demonstrate infinite knowledge, which is tantamount to saying, “I have infinite knowledge that there is no being in existence with infinite knowledge”