The book "The Second Letter of John" (2 John) is a short but important text that is part of the New Testament, namely the New Testament book "Bible, King James version". The author of this book is an anonymous author who passed down to posterity wise advice about faith, love and fostering relationships between people. The "Second Letter of John" emphasizes the importance of loving one's neighbor and fulfilling the commandments of Christ, which is the basis of Christian faith. This book encourages readers to embrace love, trust, and obedience in anticipation of Christ's Second Coming.