Auguries of Innocence

"To see a world in a grain of sand,
And a heaven in a wild flower,
Hold infinity in the palm of your hand,
And eternity in an hour."

1.What does this stanza mean?
Throughout the poem I have came to a conclusion that innocence is shaped from the negatives and bad doings of us human beings. The whole poem displays multiple examples of imageries in how innocence can be betrayed.  The examples all tie into this first stanza.  Seeing the world in "a grain of sand" is the concept of seeing the world in the smallest of things; finding innocence in the evil of the world.  Heaven/love/innocence is bound to be found, especially from the palm of your hand. It takes time for human beings to understand the intentions of human nature.  Blake tries to convince his readers to look beyond what our knowledge is used to and to open our eyes to reality. 

2. How does Blake use a literary device to convey this meaning?
Holding infinity in your hand is impossible because it is unable to be touched, like space; as eternity is incapable to have for an hour because eternity lasts forever.  Here Blake uses paradox to mimick the innocent.  People are blinded from the beauty of the world and what it beholds behind the gruesome truths of reality.