Carl Marx and Engels never talked about the idea of socialist contradictions, Lenin just had a tentative idea of it and that of Stalin was almost vague and mistaken.

• 关于社会主义社会矛盾的思想，马克思、恩格斯没有讲过，列宁只有初步的认识，斯大林的认识基本上又是模糊错误的。