Life By M. Piper -

by John Piper , a highly influential book (and often studied as a long-form essay) on living for eternal purposes rather than trivial comfort.

by Mary Pipher (often misspelled as Piper). This is a 2022 memoir that explores resilience and finding light in dark times. Life by M. Piper

Were you looking for a of one of these books, or did you have a different M. Piper in mind? by John Piper , a highly influential book

It is possible you are referring to a few different works or authors with similar names. While there is no widely known single "long paper" with that exact title, the most likely intended works are: by John Piper