Dmitri Mendeleev

"The periodic law is the only quantitative law of chemistry which is capable of being generally applied."

"I saw in the dream the table of elements arranged in accordance with their atomic weights, and when I awoke, I immediately wrote it down on a piece of paper."

"If you wish to become a philosopher, learn to ask pertinent questions."

"The elements of which man is composed are worth about 97 cents."

"A man must believe in something."

"The periodic law is the only quantitative law which applies to all elements."

"If we look at the development of chemistry, we can see that the evolution of ideas is directly connected with the perfection of apparatus."

"I have spent my life collecting what others have scattered, and scattering what others have collected."

"Greatness consists not in the extent of one's possessions, but in the strength of one's character."

"The periodic table was my greatest achievement."

"I consider it the foremost duty of a good citizen to work for the development of his country."

"Freedom is the law of nature and cannot be limited without injustice."

"When you change the way you look at things, the things you look at change."

"Perfect order is the forerunner of perfect horror."

"The future belongs to science and those who have faith in science."

"To invent, you need a good imagination and a pile of junk."

"Science is the only thing that can save us now."

"The truest estimate of a person's greatness is not in their words, but in their work."

"I do not despair of the ultimate triumph of truth."

"Knowledge leads to unity, ignorance to diversity."

"Art has no boundaries; it is the expression of the human soul."

"The elements are the alphabet of chemistry."

"I dream of a country where talent is valued above birth."

"What nature does slowly, we must learn to do quickly."

"All human knowledge begins with wonder."

"The beauty of nature is in its complexity."

"Courage is the most important quality of a leader."

"Time is the wisest counselor."

"The pursuit of knowledge is never completed."

"Hope is the anchor of the soul."