Quote by 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."

"Friendship is built on trust and honesty."

"True friendship is worth more than gold."

"Good friends are like stars, always there even when you can't see them."

"Friendship means sacrifice."