Final answer:
T.S. Eliot believed that using quotations from other works in his own was a legitimate and effective technique that added depth and richness to literature.
Step-by-step explanation:
T.S. Eliot's response to critics of his practice of using quotations from other works in his own was that he believed it was a legitimate and effective technique in creating new and innovative literature. In his essay 'Hamlet and His Problems,' Eliot argued that the use of quotations can add depth and richness to a work, and that great literature is often built upon the works of others. He believed that this practice allowed for intertextuality, which is the interconnectedness of different literary works.