Answer:
Evidence serves as support for the reason offered and helps compel audiences to accept claims. When someone haves a claim they must have an idea supporting that claim.
The Lamb is a poem of Christ. The sense of innocence can be spotted by how the poem is written. It would seem that a child is the speaker. The Tyger is a dark poem about evil. It is a recounting and an analysis of how evil looks like. The features of a tiger and their meaning can only be described if you've experienced evil.
He was a spokesperson of his generation because his books mostly spoke about people who experienced suffering due to the gilded age system of values.