From "Introduction to "Critique of Hegel's Philosophy of Right".

Marx once pointed out in the "Introduction to "Critique of Hegel's Philosophy of Right": "Of course, weapons of criticism cannot replace the criticism of weapons. Material power can only be destroyed with material power, but once the theory has mastered the masses, , will also become material power. As long as theory convinces people, it can grasp the masses; and as long as theory is thorough, it can convince people. But the root of people is people themselves. Selected Works of Marx and Engels" Volume 1, Page 9)

The philosophical thought embodied in this famous saying of Marx is the relationship between theory and practice. There are two main sentences in the words, namely, "Weapons of criticism cannot replace weapons of criticism" and "Theory, once grasped by the masses, will turn into material power." These two sentences have two meanings. The former means that "theory cannot replace practice" and the latter means that "theory has a guiding role in practice."

Extended information:

The legal thought in "Critique of Hegel's Philosophy of Right" is in this huge unfinished manuscript written between July and August 1843. , Marx not only used materialist thought to critically transform Hegel's idealist ontology of legal philosophy, and put forward the famous assertion that civil society determines the state and law, but also critically transformed Hegel's idealist legal dialectics thought.

Proposed a materialist legal dialectical view that "grasps the special logic of special objects" based on the analysis of contradictions, and then broke through Hegel in two aspects of legal ontology and legal methodology, laying the foundation for historical materialism. Jurisprudence laid the theoretical foundation. Marx's worldview transformation began with his criticism of Hegel's legal philosophy. "Critique of Hegel's Philosophy of Right" is an important symbol of Marx's transformation from an idealist legal view to a materialist legal view.

Baidu Encyclopedia-Critique of Hegel’s Philosophy of Law