Marxism is the ideological weapon of the proletarian revolution and socialist construction. It is also a kind of value system and scientific belief based on the practice and science. The unity of the ideological weapon and scientific faith is the true value of Marxism. Therefore, it is essentially a profanity and betrayal against Marxism to abandon or deny the true value of Marxism, dissever the unity of ideological weapon and scientific belief and regard Marxism as an ideological weapon or a tool to attain some goals.