"Marx did not reject the idea of a human nature. He was right not to do so." That is the conclusion of this passionate and polemical new work by Norman Geras. In it, he places the sixth of Marx's Theses on Feuerbach under rigorous scrutiny. He argues that this ambiguous statement--widely cited as evidence that Marx broke with all conceptions of human nature in 1845--must be read in the context of Marx's work as a whole. His later writings are informed...