"The Complaint of the Heart" is a poem by William Blake, part of his collection titled Songs of Experience. The poem expresses the inner turmoil and emotional struggles of the speaker, who feels a deep sense of sorrow and longing. It reflects themes of love, loss, and the complexities of human emotions. In this work, Blake uses vivid imagery and symbolism to convey the pain of unfulfilled desires. The speaker's heart becomes a metaphor for their emotional state, highlighting the conflict between personal feelings and societal expectations. Overall, the poem captures the essence of human vulnerability and the quest for understanding.