It will be gathered from the foregoing quotations that Shelley, notwithstanding is profound study of style and his exquisite perception of beauty in form and rhythm, required more than merely artistic excellences in poetry. He judged poems by their content and spirit; and while he plainly expressed his abhorrence of the didactic manner, he held that art must be moralized in order to be truly great. The distinction he drew between Theocritus and the earlier Greek singers in the "Defence of Poetry", his severe strictures on "The Two Noble Kinsmen" in a letter to Mary (August 20, 1818) and his phrase about Ariosto, "who is entertaining and graceful, and SOMETIMES a poet," illustrate the application of critical canons wholly at variance with the "art for art" doctrine. While studying Italian, he continued faithful to Greek. Plato was often in his hands, and the dramatists formed his almost inseparable companions. How deeply he felt the art of the Homeric poems, may be gathered from the following extract:--"I congratulate you on your conquest of the Iliad. You must have been astonished at the perpetually increasing magnificence of the last seven books. Homer there truly begins to be himself. The battle of the Scamander, the funeral of Patroclus, and the high and solemn close of the whole bloody tale in tenderness and inexpiable sorrow, are wrought in a manner incomparable with anything of the same kind. The Odyssey is sweet, but there is nothing like this." About this time, prompted by Mrs. Gisborne, he began the study of Spanish, and conceived an ardent admiration for Calderon, whose splendid and supernatural fancy tallied with his own. "I am bathing myself in the light and odour of the starry Autos," he writes to Mr. Gisborne in the autumn of 1820. "Faust", too, was a favourite. "I have been reading over and over again "Faust", and always with sensations which no other composition excites. It deepens the gloom and augments the rapidity of ideas, and would therefore seem to me an unfit study for any person who is a prey to the reproaches of memory, and the delusions of an imagination not to be restrained." The profound impression made upon him by Margaret's story is expressed in two letters about Retzsch's illustrations:--"The artist makes one envy his happiness that he can sketch such things with calmness, which I only dared look upon once, and which made my brain swim round only to touch the leaf on the opposite side of which I knew that it was figured."