Answer:
It helps create a mood of sin, guilt, and mystery.
Explanation:
The tree in William Blake's poem grew rooted in bad, sinful feelings like the anger the speaker felt about his friend. Although this tree has given fruitful and inviting fruits, we know that these fruits carry the same anger present in the tree and it is this fruit that kills the speaker's friend. This generates in the poem a climate of sin, guilt and mystery.
