"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…"

"I believe in the power of observation and experiment above all else."

"Hypotheses help and guide scientific work — the search for truth — as the tiller's plough helps the cultivation of useful plants."

"To protect the Russian borders from enemies, I would surround the whole country with a continuous wall of vodka."

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