Christian apologetics is a field of Christian theology that aims to present a rational basis for the Christian faith, defend the faith against objections, and expose the perceived flaws of other world views. Christian apologetics have taken many forms over the centuries, starting with Paul of Tarsus, including writers such as Origen and Augustine of Hippo, and continuing currently with the modern Christian community, through the efforts of many authors in various Christian traditions such as C.S. Lewis. Apologists have based their defense of Christianity on historical evidence, philosophical arguments, scientific investigation, rhetorical persuasion and other disciplines.