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is to the seven years at Lambeth that what may be called the first period of the Prophetic Books largely belongs, though it does not indeed begin there. The roots of it are strongly visible in The Marriage of Heaven and Hell, which was written at Poland Street, and they may be traced even further back. Everything else, until we come to the last or Felpham period, which has a new quality of its own, belongs to Lambeth.

In his earlier work Blake is satisfied with natural symbols, with nature as symbol; in his later work, in the final message of the Prophetic Books, he is no longer satisfied with what then seems to him the relative truth of the symbols of reality. Dropping the tools with which he has worked so well, he grasps with naked hands after an absolute truth of statement, which is like his attempt