Dmitri Mendeleev — "I have always been a practical man, and my science is for the benefit of mankind…"

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

"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 invisible world of chemical atoms is still waiting for the creator of chemical mechanics."

"There is no death, but only change."

"Experiment itself cannot give truth, but it gives the means of destroying erroneous representations whilst confirming those which are true in all their consequences."