Epistle to the Philippians is a letter in the New Testament of the Bible that the apostle Paul wrote to the church in Philippi. It is also referred to as the "Letter to the Philippians" or "Philippians." The letter is known for its optimistic tone, emphasis on personal relationships and heartfelt words of encouragement. Philippians is also sometimes called the "Epistle of Joy" because of Paul's repeated emphasis on joy throughout the letter. Some other synonyms for Epistle to the Philippians include "Philippians Letter," "Letter to the Philippians," and "Epistle of Philippi." Regardless of what it is called, this letter remains a significant piece of early Christian literature, still relevant today.