The clear religious elements of "The Tyger" also have bearing on this message of true knowledge and its fearsome un-attainability. The querying voice of the speaker and the progression of the poem creates something of a narrative quest for knowledge, and "natural imagery" in Blake's work "invariably serves a prophetic purpose," according to one scholar (Altizer, p. 31). In this instance, however, what the tiger (an unusual yet strong natural image) prophesizes is only the terror and the futility of advancing further in the quest to understand the tiger's maker, i.e. God. The continued bafflement of the speaker and the awe (in the full meaning of the word) that a consideration of God's work inspires in him is evidenced by the last lines of the penultimate stanza, the last two lines of original verse (the last stanza being a repetition of the first): "Did he...

Digging deeper shows that there are many layers of meaning embedded in this poem, though, and that a quest for knowledge can yield some rewards. These rewards might not be as complete as desired and the answers might not be expected, but like a consideration of the tiger they are quite informative.
Works Cited

Altizer, Thomas J.J. The New Apocalypse: The Radical Christian Vision of William Blake. Aurora, CO: The Davies Group, Publishers, 2000.

Blake, William. "The Tyger." Accessed 2 October 2012. http://www.eecs.harvard.edu/~keith/poems/tyger.html

Damon, S. Foster. William Blake: His Philosophy and Symbols. London: Dawsons, 1969.