We may sum up the doctrines of the Apologists as follows: (1) Christianity is revelation, i.e., it is the divine wisdom, proclaimed of old by the prophets and, by reason of its origin, possessing an absolute certainty which can also be recognised in the fulfilment of their predictions. As divine wisdom Christianity is contrasted with, and puts an end to, all natural and philosophical knowledge. (2) Christianity is the enlightenment corresponding to the natural but impaired knowledge of man.[414] It embraces all the elements of truth in philosophy, whence it is _the_ philosophy; and helps man to realise the knowledge with which he is naturally endowed. (3) Revelation of the rational was and is necessary, because man has fallen under the sway of the demons. (4) The efforts of philosophers to ascertain the right knowledge were in vain; and this is, above all, shown by the fact that they neither overthrew polytheism nor brought about a really moral life. Moreover, so far as they discovered the truth, they owed it to the prophets from whom they borrowed it; at least it is uncertain whether they even attained a knowledge of fragments of the truth by their own independent efforts.[415] But it is certain that many seeming truths in the writings of the philosophers were imitations of the truth by evil demons. This is the origin of all polytheism, which is, moreover, to some extent an imitation of Christian institutions. (5) The confession of Christ is simply included in the acknowledgment of the wisdom of the prophets; the doctrine of the truth did not receive a new content through Christ; he only made it accessible to the world and strengthened it (victory over the demons; special features acknowledged by Justin and Tertullian). (6) The practical test of Christianity is first contained in the fact that all persons are able to grasp it, for women and uneducated men here become veritable sages; secondly in the fact that it has the power of producing a holy life, and of overthrowing the tyranny of the demons. In the Apologists, therefore, Christianity served itself heir to antiquity, i.e., to the result of the monotheistic knowledge and ethics of the Greeks: "[Greek: Osa oun para pasikalos eiretai, hemon ton Christianon esti]" (Justin, Apol. II. 13). It traced its origin back to the beginning of the world. Everything true and good which elevates mankind springs from divine revelation, and is at the same time genuinely human, because it is a clear expression of what man finds within him and of his destination (Justin, Apol. I. 46: [Greek: hoi meta logou biosantes Christianoi eisi, kan atheoi enomisthesan, oion en Hellesi men Sokrates kai Erakleitos kai oi omoioi autois, en barbarois de Abraam k.t.l.], "those that have lived with reason are Christians, even though they were accounted atheists, such as Socrates and Heraclitus and those similar to them among the Greeks, and Abraham etc. among the barbarians"). But