ossible, still, at his death, he never claimed to have discovered any piece of knowledge whatsoever. After its introduction into Greek culture at the end of the fourth century BC, skepticism influenced nearly all other Greek philosophies. Both Hellenistic and Roman philosophies took it as a given that certain knowledge was impossible; the focus of Greek and Roman philosophy, then, turned to probable knowledge, that is, knowledge that is true most of the time. Christianity, however, introduced a dilemma into Greek and Roman philosophies that were primarily based on skeptical principles. In many ways, the philosophy of Christianity, which insisted on an absolute knowledge of the divine and of ethics, did not fit the Greek and Roman skeptical emphasis on probable knowledge. Paul of Tarsus, one of the original founders of Christianity, answered this question simply: the knowledge of the Romans and Greeks, that is, human knowledge, is the knowledge of fools. Knowledge that rejects human reasoning, which, after all, leads to skepticism, is the knowledge of the wise. Christianity at its inception, then, had a strong anti-rational perspective. This did not, however, make the skeptical problem go away. Much of the history of early Christian philosophy is an attempt to paste Greek and Roman philosophical methods and questions onto the new religion; the first thing that had to go was the insistence on skepticism and probable knowledge. So early Christian thinkers such as Augustine and Boethius took on the epistemological traditions of Greece and Rome to demonstrate that one could arrive at certain knowledge in matters of Christian religion. Augustine devoted an entire book, "Against the Academics," to proving that human beings can indeed arrive at certain knowledge. Skepticism, however, was radically reintroduced into Western culture in the sixteenth and seventeenth centuries. The break-up of the Christian church and the bloodshed that ...