There is in fact no such thing as art for art's sake, art that stands above classes, art that is detached from or independent of politics. Proletarian literature and art are part of the whole proletarian revolutionary cause.
There is nothing more becoming a wise man than to make choice of friends, for by them thou shalt be judged what thou art. Let them therefore be wise and virtuous, and none of those that follow thee for gain; but make election rather of thy betters than thy inferiors; shunning always such as are poor and needy, for if thou givest twenty gifts and refuse to do the like but once, all that thou hast done will be lost, and such men will become thy mortal enemies.
There is only one art, whose sole criterion is the power, the authenticity, the revelatory insight, the courage and suggestiveness with which it seeks its truth. Thus, from the standpoint of the work and its worth it is irrelevant to which political ideas the artist as a citizen claims allegiance, which ideas he would like to serve with his work or whether he holds any such ideas at all.
There is the falsely mystical view of art that assumes a kind of supernatural inspiration, a possession by universal forces unrelated to questions of power and privilege or the artist's relation to bread and blood. In this view, the channel of art can only become clogged and misdirected by the artist's concern with merely temporary and local disturbances. The song is higher than the struggle.