William Cowper (1731-1800), pronounced "cooper," was an popular English poet and hymnodist. His focus as a poet on the everyday life of the English countryside influenced the early Romantics. He famously suffered from severe depression. He was also a zealous evangelical Christian.
Cowper also translated Homer into blank verse--don't confuse him with Chapman.
On the GRE Literature exam, you're mostly likely to need to identify the following Cowper quotes:
1. "variety's the very spice of life"
2. "God made the country, and man the town"
3. "God moves in a mysterious way / His wonders to perform"
Cowper is not worth adding to your GRE reading list.