A topical-chronological study of the development of evangelical doctrine for the purpose of answering the question, how did evangelicals come to believe what they believe today? Each of the key theological loci covered in systematic theology (the doctrines of Scripture, God, humanity and sin, Jesus Christ and the Holy Spirit, redemption, the church, and the last things) will be considered, with the development of these loci being traced chronologically beginning with the early church, continuing through the medieval period, extending into the Reformation and post-Reformation era, and concluding with the modern scene.