Dmitri Mendeleev — "There is no death, but only change."

"There exists everywhere a medium in things, determined by equilibrium."

"In science we must all submit not to what seems to us attractive from one point of view or another, but to what represents an agreement between theory and experiment."

"The greatest value of a scientific discovery is not so much in the discovery itself as in the stimulus it provides for further investigation."

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

"The most important thing for a scientist is to be honest with himself and with others."