In stanza 4 of "The Poison Tree," the narrator feels happy because his foe fell into his trap. The stanza reads, "And it grew both day and night, Till it bore an apple bright, And my foe beheld it shine, And he knew that it was mine— And into my garden stole When the night had veiled the pole; In the morning, glad, I see My foe outstretched beneath the tree." Therefore, the narrator's happiness comes from the fact that his enemy was tricked into stealing the apple and then died as a result.