Against this whole group of tendencies there was more than one reaction. The tendency to dogmatize was met by the tendency to doubt; and the tendency to doubt flowed in many streams, which can with difficulty be traced in minute detail, but whose general course is sufficiently described for the ordinary student in the _Academics_ of Cicero. In the second and third centuries of our era there had come to be three main groups of schools. “Some men,” writes Sextus Empiricus,[207] “say that they have found the truth; some say that it is impossible for truth to be apprehended; some still search for it. The first class consists of those who are specially designated Dogmatics, the followers of Aristotle and Epicurus, the Stoics, and some others: the second class consists of the followers of Clitomachus and Carneades, and other Academics: the third class consists of the Sceptics.” They may be distinguished as the philosophy of assertion, the philosophy of denial, and the philosophy of research.[208] But the first of these was in an overwhelming majority. The Dogmatics, especially in the form either of pure Stoicism or of Stoicism largely infused with Platonism, were in possession of the field of educated thought. It is a convincing proof of the completeness with which that thought was saturated with their methods and their fundamental conceptions, that those methods and conceptions are found even among the philosophers of research who claimed to have wholly disentangled themselves from them.[209] * * * * * The philosophy of assertion, the philosophy of denial, and the philosophy of research, were all alike outside the earliest forms of Christianity. In those forms the moral and spiritual elements were not only supreme but exclusive. They reflected the philosophy, not of Greece, but of Palestine. That philosophy was almost entirely ethical. It dealt with the problems, not of being in the abstract, but of human life. It was stated for the most part in short antithetical sentences, with a symbol or parable to enforce them. It was a philosophy of proverbs. It had no eye for the minute anatomy of thought. It had no system, for the sense of system was not yet awakened. It had no taste for verbal distinctions. It was content with the symmetry of balanced sentences, without attempting to construct a perfect whole. It reflected as in a mirror, and not unconsciously, the difficulties, the contradictions, the unsolved enigmas of the world of fact. When this Palestinian philosophy became more self-conscious than it had been, it remained still within its own sphere, the enigmas of the moral world were still its subject-matter, and it became in the Fathers of the Talmud on the one hand fatalism, and on the other casuistry.