Texts are saturated with the cultures and histories that produce them. Even a work that seems "timeless" carries the fingerprints of its moment in its vocabulary, its assumptions about who matters, and the problems it treats as urgent. Learning to read the cultural and historical setting of a text lets you explain not just what it says but why it could be said in that way, then and there.
It helps to separate two overlapping ideas. The historical setting refers to datable events and conditions: a revolution, an economic boom, a technological change, a war, a migration. The cultural setting refers to shared values, beliefs, rituals, tastes, and social norms, some of which change slowly and are harder to pin to a single date. A text about a wedding, for in