On the side of reason was urged first the claim of the testimony of the senses, and second the validity of logical inference as determined by demonstration and syllogistic proof. This does not mean that the Jewish thinkers of the middle ages developed unaided from without a system of thought and a _Weltanschauung_, based solely upon their own observation and ratiocination, and then found that the view of the world thus acquired stood in opposition to the religion of the Bible and the Talmud, the two thus requiring adjustment and reconciliation. No! The so-called demands of the reason were not of their own making, and on the other hand the relation between philosophy and religion was not altogether one of opposition. To discuss the latter point first, the teachings of the Bible and the Talmud were not altogether clear on a great many questions. Passages could be cited from the religious documents of Judaism in reference to a given problem both _pro_ and _con_. Thus in the matter of freedom of the will one could argue on the one hand that man must be free to determine his conduct since if he were not there would have been no use in giving him commandments and prohibitions. And one could quote besides in favor of freedom the direct statement in Deuteronomy 30, 19, "I call heaven and earth to witness against you this day, that I have set before thee life and death, the blessing and the curse: therefore choose life, that thou mayest live, thou and thy seed." But on the other hand it was just as possible to find Biblical statements indicating clearly that God preordains how a person shall behave in a given case. Thus Pharaoh's heart was hardened that he should not let the children of Israel go out of Egypt, as we read in Exodus 7, 3: "And I will harden Pharaoh's heart, and multiply my signs and my wonders in the land of Egypt. But Pharaoh will not hearken unto you, and I will lay my hand upon Egypt, and bring forth my hosts, my people, the children of Israel, out of the land of Egypt by great judgments." Similarly in the case of Sihon king of Heshbon we read in Deuteronomy 2, 30: "But Sihon king of Heshbon would not let us pass by him: for the Lord thy God hardened his spirit, and made his heart obstinate, that he might deliver him into thy hand, as at this day." And this is true not merely of heathen kings, Ahab king of Israel was similarly enticed by a divine instigation according to I Kings 22, 20: "And the Lord said, Who shall entice Ahab, that he may go up and fall at Ramoth-Gilead?"