Stalin has well said, "Theory becomes purposeless if it is not connected with revolutionary practice, just as practice gropes in the dark if its path is not illumined by revolutionary theory." 斯大林说得好：“理论若不和革命实践联系起来，就会变成无对象的理论，同样，实践若不以革命理论为指南，就会变成盲目的实践。”
