"I have been called a charlatan, a madman, and a dreamer, but I have always pursued the truth."

"It is the function of science to discover the existence of a general reign of order in nature and to find the causes governing this order. And this refers in equal measure to the relations of man - so…"

"The greatest good is the knowledge of the truth."

"Why do they [Americans] quarrel, why do they hate Negroes, Indians, even Germans, why do they not have science and poetry commensurate with themselves, why are there so many frauds and so much nonsens…"

"The periodic law will not be overthrown, but only further developed."