This lesson looks at the life and writings of Justin Martyr, one of the most important early Christian apologists and theologians. After looking at defenses of the faith within Scripture, we show how Justin Martyr defended the faith. One of the important differences between our time and his was his ability to point to the holy lives of Christians as evidence of the genuineness of Christianity. He also illustrates how attempts to harmonize Christian thought with non-Christian thought and philosophy can at times lead to puzzling conclusions and the distortion of Christian doctrines.