Arrange the following four sentences in a proper sequence to form a coherent paragraph:
(a) These high plans died, slowly but definitively, and were replaced by the dream of a huge work on philosophy.
(b) In doing whatever little he could of the new plan, the poet managed to write speculations on theology, and political theory.
(c) The poet’s huge ambitions included writing a philosophic epic on the origin of evil.
(d) However, not much was done in this regard either, with only fragments being written.