The Cultivation of Anger
The principal theme of "A Poison Tree" is not anger itself but how the suppression of anger leads to the cultivation of anger. Burying anger rather than exposing it and acknowledging it, according to "A Poison Tree," turns anger into a seed that will germinate. Through the cultivation of that seed, which is nourished by the energy of the angry person, wrath grows into a mighty and destructive force.
The Wrathfulness of the Old Testament God
An implicit theme of "A Poison Tree" is that the god of the Old Testament is a god of wrath, cunning, jealousy, and guile. Blake presents this theme in the poem by alluding to the story of the Fall in Genesis. The tree in Blake's poem is intended to remind the reader of the Tree of the Knowledge of Good and Evil. The bright apple represents the fruit on that tree, which God forbids Adam and Eve to eat, thus making it more appealing. The garden into which the foe steals signifies the Garden of Eden, where Adam and Eve act in stealth and disobey God. The attitude of the speaker himself is to be understood as a reflection of God's attitude. By showing the speaker of the poem acting in a way reminiscent of God, Blake is showing God to be not a god of love but a cruel god and is thus criticizing the commonly held idea of God.
Suppression versus Expression
To the extent that "A Poison Tree" teaches a lesson and...
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