When he wrote the narrative poem "Isabella" in 1818, his thoughts shifted from emphasizing sensual enjoyment to emphasizing depth of thought. In 1819, Keats wrote his masterpieces: the ode "Nightingale", "Greek Urn", "Sorrow", "Soul" and the lyric poem "Loveless Beauty", the sonnet "Brilliant Star, May I "Can I Be With You Forever" and so on, have become the essence of Keats's poetry and an immortal work in British poetry. In the same year, he also wrote the lyric poem "Lamia" and other works.