The book of 2 Peter is a letter in the New Testament attributed to the Apostle Peter. It addresses early Christians, warning them about false teachers and encouraging them to grow in their faith. The letter emphasizes the importance of knowledge and moral living, urging believers to remain steadfast in their beliefs. In 2 Peter, the author also discusses the promise of Christ's return and the need for patience as believers await this event. The letter reassures Christians that God's timing is different from human expectations, and it encourages them to live righteously in anticipation of the future.