I am greatly pleased with the public, authentic isolation in which we two, you and I, now find ourselves. It is wholly in accord with our attitude and our principles.

There are no circumstances imaginable, not even victory, under which the proletariat should give up its possession of arms.

Darwin has interested us in the history of nature's technology.

[Napoleon] swept away everywhere the establishments of feudality. ... [He was] Caesar himself.

We know only a single science, the science of history. History can be contemplated from two sides, it can be divided into the history of nature and the history of mankind. However, the two sides are not to be divided off; as long as men exist the history of nature and the history of men are mutually conditioned.

The product of mental labor - science - always stands far below its value, because the labor-time necessary to reproduce it has no relation at all to the labor-time required for its original production.

So far no chemist has ever discovered exchange-value either in a pearl or a diamond.