"Auguries of Innocence"
an excerpt

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 the stanza mean?
I think the stanza means that even the smallest and insignificant things in life are part of something that create a whole. A grain of sand can not stand for itself; billions and billions of grains of sand compose a shoreline, a sandy beach. But without the other grains it would not complete the whole. As for a wild flower which grows without intention of being planted of mixed species, could be valued and contemplated just as a beautiful red rose. Blake is saying that living the moment and appreciating the small and insignificant can bring as much joy as the big and valuable things in life.

2. How does Blake use a literary device to convey that meaning?

Blake uses ambiguity when saying "to see a world in a grain of sand" because he can mean that parts compose the whole, like a grain of sand composes a sandy beach. He can also mean that nature and people are each a grain of sand that complete the whole, meaning the world.