This book is believed to a letter from the Apostle Paul to Timothy. It is one of three letters in the New Testament of the Bible that are called the Pastoral Epistles, along with Second Timothy and Titus. These letters are called "pastoral", because the are sent to persons who are pastors of Christian churches.Timothy was a pastor in Ephesus (Chapter 1, verse 3). The letter gives advice on the organization of the Church and how the leaders in it should act. They are also told to be faithful to the truth even though all around them were false ideas.