Definition: In the Bible, "epistle" refers to a letter written by Christ and Paul to the Ephesian church (Acts 16:30-42). The word has a broader meaning beyond just being an expression of Christianity; it can also refer to a written document or communication that is used in a formal or official context. In the Bible, "epistle" refers to any written message written for an audience other than its intended recipient (e.g., an address letter or a pastoral letter). It can be sent out by a church leader, pastor, bishop, or other high-ranking official of that particular institution. The text of an epistle typically includes details about the subject matter being discussed, as well as any personal reflections or anecdotes from the writer. The word "epistle" is also used figuratively to refer to any communication that is meant to persuade someone of a point or encourage them. For example, when we read John's letter to the Galatians, we are not merely reading a book about faith and gospel message; we are being encouraged to believe in Jesus as our Lord. So in summary, "epistle" is a formal written communication that serves the purpose of conveying information or arguments, and it can be used in many different contexts beyond just Christianity.