What was William Blake's purpose for writing the poem "The Tyger?"

wrote two
corresponding sets of verses called "Songs of Innocence" and "Songs of
Experience." In "Songs of Innocence," Blake looked on life as if through the eyes
of a child; he presented an innocent, trusting, and optimistic viewpoint on his subjects. In
"Songs of Experience," on the other hand, he presented the same or similar topics from
a mature, pessimistic, and even dark perspective. In this way, by showing two contrasting sides
to a topic, he believed the real truth could be better perceived. 

"" is a Song of Experience; its corresponding poem is "The Lamb."
"The Lamb" presents God as the Lamb of God, an image that is sweet and comforting; the
poem is written as if a little child were addressing a lamb. "The Tyger" is best
understood in comparison with "The Lamb." In "The Tyger," God is presented
as something like a powerful mad scientist, forging in his heavenly "furnace" a beast
ruthless and deadly. The Tyger is a symbol of violence, oppression, and fear. The multiple
questions to the Tyger about who made it leave the impression that the speaker is blaming God
for the evil and pain that exists in the world and questioning the motives of such a
Creator. 

It would be a mistake to say that Blake's purpose in writing
"The Tyger" was to show that God is the source of pain and violence in the world, just
as it would be a mistake to assume that Blake's purpose in writing "The Lamb" was to
convert people to a belief in Jesus Christ. Blake's purpose in writing the TWO
poems was to show the contrasting sides of God in hopes of developing a fuller understanding of
who God really is.

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