His Own Times (1954). Blake was concerned about senseless wars and the blighting effects of the Industrial Revolution. Much of his poetry recounts in symbolic allegory the effects of the French and American revolutions. Erdman claims Blake was disillusioned with the political outcomes of the conflicts, believing they had simply replaced monarchy with irresponsible mercantilism. Erdman also notes Blake was deeply opposed to slavery and believes some of his poems, read primarily as championing "free love", had their anti-slavery implications short-changed. A more recent study, William Blake: Visionary Anarchist by Peter Marshall (1988), classified Blake and his contemporary William Godwin as forerunners of modern anarchism. British Marxist historian E. P. Thompson's last finished work, Witness Against the Beast: William Blake and the Moral Law (1993), claims to show how far he was inspired by dissident religious ideas rooted in the thinking of the most radical opponents of the monarchy during the English Civil War. Development of views Because Blake's later poetry contains a private mythology with complex symbolism, his late work has been less published than his earlier more accessible work. The Vintage anthology of Blake edited by Patti Smith focuses heavily on the earlier work, as do many critical studies such as William Blake by D. G. Gillham. The earlier work is primarily rebellious in character and can be seen as a protest against dogmatic religion especially notable in The Marriage of Heaven and Hell, in which the figure represented by the "Devil" is virtually a hero rebelling against an imposter authoritarian deity. In later works, such as Milton and Jerusalem, Blake carves a distinctive vision of a humanity redeemed by self-sacrifice and forgiveness, while retaining his earlier negative attitude towards what he felt was the rigid and morbid authoritarianism of traditional religion. Not all readers of Blake agree upon how much continuity exists between Blake's earlier and later works. Psychoanalyst June Singer has written that Blake's late work displayed a development of the ideas first introduced in his earlier works, namely, the humanitarian goal of achieving personal wholeness of body and spirit. The final section of the expanded edition of her Blake study The Unholy Bible suggests the later works are the "Bible of Hell" promised in The Marriage of Heaven and Hell. Regarding Blake's final poem, Jerusalem, she writes: "The promise of the divine in man, made in The Marriage of Heaven and Hell, is at last