" To the first class belong the Gospels and Acts; to the second, the Epistles; to the third, the Revelation. "
- Philip Schaff

In Philip Schaff's statement, he categorizes biblical texts into three distinct classes based on their nature and content. The first class includes the Gospels and Acts, which are narratives that primarily recount the life and teachings of Jesus Christ as well as the early history of Christianity. The second category comprises the Epistles, letters written by apostles such as Paul to various Christian communities, offering guidance, instruction, and theological insights. Lastly, the third class is the Revelation, an apocalyptic text filled with symbolic visions meant to offer hope and warnings.

Schaff's classification provides insight into the diverse purposes and styles of biblical literature. By grouping them this way, he highlights the unique contributions each type makes to Christian theology and practice. The Gospels and Acts serve as foundational narratives that establish a historical and experiential basis for faith. The Epistles, on the other hand, offer practical guidance and address specific issues faced by early churches, bridging theory with everyday life. Finally, the Revelation speaks in a highly symbolic language, challenging readers to interpret divine messages beyond literal meanings.

Philip Schaff was a prominent 19th-century American historian and theologian known for his extensive work on church history and biblical scholarship. His systematic approach to understanding religious texts reflects his rigorous academic background and deep engagement with both Protestant and Catholic traditions. As an influential figure in the field, his insights have contributed significantly to theological discussions and scholarly debates over centuries.