The edifice of science not only requires material, but also a plan. Without the material, the plan alone is but a castle in the air-a mere possibility; whilst the material without a plan is but useless matter.
Dmitri MendeleevWhy do they [Americans] quarrel, why do they hate Negroes, Indians, even Germans, why do they not have science and poetry commensurate with themselves, why are there so many frauds and so much nonsense? I cannot soon give a solution to these questions ... 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.
Dmitri MendeleevThe elements, if arranged according to their atomic weights, exhibit an apparent periodicity of properties.
Dmitri MendeleevI saw in a dream a table where all the elements fell into place as required. Awakening, I immediately wrote it down on a piece of paper.
Dmitri Mendeleev