The greatest living thinker ceased to think.
The gap that has been left by the departure of this mighty spirit will soon enough make itself felt.
Just as Darwin discovered the law of development of organic nature, so Marx discovered the law of development of human history.
But that is not all. Marx also discovered the special law of motion governing the present-day capitalist mode of production and the bourgeois society that this mode of production has created.
Two such discoveries would be enough for one lifetime. But in every single field which Marx investigated — and he investigated very many fields, none of them superficially — even in that of mathematics, he made independent discoveries.
Science was for Marx a historically dynamic, revolutionary force.
For Marx was before all else a revolutionist. His real mission in life was to contribute, in one way or another, to the overthrow of capitalist society, and to the liberation of the modern proletariat.
Fighting was his element. And he fought with a passion, a tenacity and a success such as few could rival.
And, consequently, Marx was the best-hated and most calumniated man of his time. All this he brushed aside as though it were cobweb. And he died beloved, revered and mourned by millions of revolutionary fellow-workers — from the mines of Siberia to California, in all parts of Europe and America — though he may have had many opponents he had hardly one personal enemy.
His name will endure through the ages, and so also will his work!