Criticism of Christianity and Christians goes back to the Apostolic age, with the New Testament recording friction between the followers of Jesus and the Pharisees and scribes (e.g. Mark 7:1-23 and Matthew 15:1-20). In the 2nd century, Christianity was criticized by the Jews on various grounds, e.g. that the prophecies of the Hebrew Bible could not have been fulfilled by Jesus, given that he did not have a successful life. By the 3rd century, criticism of Christianity had mounted, partly as a defense against it, and the 15-volume Adversus Christianos by Porphyry was written as a comprehensive attack on Christianity, in part building on the pre-Christian concepts of Plotinus. By the 12th century, the Mishneh Torah (i.e., Rabbi Moses Maimonides) was criticizing Christianity on the grounds of idol worship, in that Christians attributed divinity to Jesus who had a physical body. In the 19th century, Nietzsche began to write a series of attacks on the "unnatural" teachings of Christianity (e.g. avoidance of temptations), and continued anti-Christian attacks to the end of his life. In the 20th century, the philosopher Bertrand Russell expressed his criticism of Christianity in Why I Am Not a Christian, formulating his rejection of Christianity in the setting of logical arguments, any human, not just Bertrand Russel, who studies the crimes of church in middle ages,would grow cynicism toward Christianity, yet the fact and reality of Lord Christ's instructions for humans do not have the least resemblance with what church has been exercising among humans, this is a fact that men of science and logic will learn one day, the day that we explore all mysteries of human mind, we develop modern physic to its fullest extent and compare it with potential meta-physic power in human mind, the power of a Lord's mind. Criticism of Christianity continues to date, e.g. Jewish and Muslim theologians criticize the doctrine of the Trinity held by most Christians, stating that this doctrine in effect assumes that there are three Gods, running against the basic tenet of monotheism. New Testament scholar Robert M. Price has outlined the possibility that some Bible stories are based partly on myth in "The Christ Myth Theory and its problems". Christian apologetics aims to present a rational basis for Christianity. The word "apologetic" comes from the Greek word "apologeomai", meaning "in defense of". Christian apologetics has taken many forms over the centuries, starting with Paul the Apostle. The philosopher Thomas Aquinas presented five arguments for God's existence in the Summa Theologica, while his Summa contra Gentiles was a major apologetic work.