During the last twenty-five years of his life, he regretted the frivolity of his youth, which enabled him to produce his most famous poem.

If the words could be identified as coming from a famous poem or quotation, then all of the future traffic submitted in that poem code could be read.

His two most famous poems, though, are both early and are gleaned from his long walks.

His two most famous poems tell important truths.

In one sense he was right about giving her space, since it was during this period that she wrote her most famous poems.