Addressed to persecuted believers, Peter's first letter encourages them with the knowledge that it is possible to live victoriously in the midst of hostility - just as Christ did. He exhorts them to live a holy life that they might be a witness and evangelize the world through their faithfulness. In his second epistle, Peter warns against more subtle dangers from within the church - false teachers and errant doctrine. He also emphasizes the importance of scriptural knowledge, for only in understanding true doctrine will heresies be known and immoral behaviour exposed. Robert Leighton's and Griffith Thomas's explorations of 1 and 2 Peter offer resounding wisdom that will both instruct and encourage all Christians.