Dmitri Mendeleev

It is the duty of the chemist to teach the world how to use the elements wisely.

The chemical elements are not created, but are transformed.

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

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

The periodic law is the most important generalization in chemistry, and it has no equal in any other branch of science.

The knowledge of the properties of the elements is the foundation of all chemistry.

I have always been a practical man, and my science is for the benefit of mankind.

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

I saw in a dream a table where all the elements fell into place as required.

There is nothing in this world that I fear to say.

The elements, if arranged according to their atomic weights, exhibit an apparent periodicity of properties.

I have no need of proof; the laws of nature, unlike the laws of grammar, admit of no exception.

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

A well-made theory is like a good overcoat; Eloquent words are like a beautiful tie.

The capital fact to note is that petroleum was born in the depths of the earth, and it is only there that we must seek its origin.

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

It was clear that in the United States there was a development not of the best, but of the middle and worst sides of European civilization; the notorious general voting, the tendency to politics... all the same as in Europe. A new dawn is not to be seen on this side of the ocean.

The most all penetrating spirit before which will open the possibility of tilting not tables, but planets, is the spirit of free human inquiry. Believe only in that.

No one nor anything can silence me.

Doctor, you have science, I have faith.