Contrast the views and attitudes of two sets of paired poems in Blake's SONG'S OF INNOCENCE AND SONG'S OF EXPERIENCE and state what Blake was [con't]trying to emphasize by means of these contrasts.
In "The Lamb" and "The Tyger," Blake reveals two sides of existence: the pure, innocent, benevolent, and harmless in the figure of the lamb, and the aggressive, dangerous, powerful, and ferocious in the tiger. The same creator made both. Existence, for nature and for human, is a mixture of these. The lamb and the tiger are not in opposition, but are simply two different sides of the same existence.
In the two poems featuring chimney sweepers, the party line or status quo (the innocent) is contrasted with one who knows the truth, one who knows better (the experienced). These poems deal with perspectives, as well as with contemporary social issues in Blake's day. The first chimney sweeper poem features a sweep that accepts what parents, the church, society tell him--the party line or status quo. The second poem is more aware. The party line is a facade used to keep sweeps in line and to justify the abuse parents, the church, and society heap upon children.
These two pairs of companion poems demonstrate Blake's ideas concerning existence and perspectives.