Research Papers / William Blake biography essay - the world as seem the poem? [2]

Well I'm having really big problem right now
I need to write a 4 page essay on William Blake biography
And I can't even come up with a theisis
Essay must be MLA style which is not that hard
It's just I can't start first I need a theisis so I can start writing.
My teacher gave an question if I answer it I might find a theisis
Anyway here it is :how did Blake biography affects. The way he looked to the world as seem the poem?
I reallly have no clue what she's talking about
Essay is due Friday
Please if any English god out there please help me
Thanks in advance :(