The other examples of the use of this form of the argument for the existence of God are found in Lactantius, "the Christian Cicero." In speaking of Socrates he introduces[69] with approval an epitome of the Athenian sage's argument, which we have already considered,[70] and, in combatting the atomistic theory of the origin of the world, he asserts[71] that neither atoms nor the "Nature" of Lucretius can account for the adaptations in the actual world; and the phenomena of mind, especially, proclaim an intelligent Providence. His treatise "On the Workmanship of God, or the Formation of Man," is almost entirely an argument to design from the phenomena of man's physical and mental nature. From the standpoint of the physiology and psychology of his time, he discusses in detail the function and working of the different parts of man's nature, and from the adaptation of means to ends, of organs to their functions, which, even with the scanty data of the science of that day, is a striking consideration, he concludes that man's being can only be accounted for on the supposition of an Arranger or Planner, whose purposes are carried out in exercise of the various functions.
The argument e Consensu Gentium has often been accredited with being peculiarly the patristic argument for the existence of God,[72] and for this conclusion the use of it in Epicurean theology, and the doctrine of the natural, innate idea of God already considered, would fully prepare us; but the fact is that, apart from frequent passing references to the "natural opinion" mentioned in the preceding chapter, the instances in which the argument is explicitly made use of are not much more numerous than in the case of the other forms. They constantly appeal to the common consent, but it is generally against polytheism, as indicating a consciousness of the unity of God. St. Justin Martyr, in the passage to which we have already alluded, asserts[73] this common consent, but only as preparatory to the certainty which he finds in revelation. St. Clement of Alexandria, after asserting that "the Father and Maker of all things is apprehended by all things, agreeably to all, by innate power, and without teaching," goes on to confirm his statement in this manner:[74] "But no race anywhere, of tillers of the soil, or nomads, and not even of dwellers in cities, can live without being imbued with the faith of a superior being. Wherefore, every eastern nation, and every nation touching the western shore; or the north, and each one toward the south—all have one and the same preconception respecting Him, who hath appointed government; since the most universal of His operations equally pervade all." It is with the principles and end of this argument in view that Tertullian appeals[75] to the witness of the soul, "not as when fashioned in schools, trained in libraries, fed in Attic academies and porticoes," but "rude, uncultured and untaught, such as they have thee who have thee only; that very thing of the road, the street, the workshop wholly;" and from his examination of this ordinary soul he concludes that "the knowledge of our God is possessed by all."[76] Minucius Felix appeals to this same common instinct and exclaims:[77] "What! is it not true that I have in this matter the consent of all men?" and Origen, in his reply to the attack of Celsus, points to "the ineradicable idea of Him."[78] Novatian asserts[79] that "the whole mind of man is conscious" of Him, "even if does not express itself," and Lactantius thinks that for Cicero "it was no difficult task, indeed, to refute the falsehoods of a few men who entertained perverse sentiments by the testimony of communities and tribes, who on this one point had no disagreement."[80]
Besides these instances in which the different types of the theistic argument are used in an undeveloped, but yet in a pure form, there are several places where a mixed form appears, the different conventional processes being used in combination without being clearly differentiated. Thus the argument from common consent and the argument based on order or design are used in conjunction, the necessity of the universal knowledge of God's existence being seen from the witness to Him found in nature.[81] So, too, the arguments from order and from design in nature are often used in conjunction, and in many passages it is difficult to decide to which one of these two the author intends to appeal primarily.[82] These undifferentiated or mixed arguments are quite frequently to be seen in the patristic writings, and serve to illustrate the eclectic character of their thoughts, often presenting in one passage the forms of the theistic arguments peculiar to two opposed schools in Greek philosophy; and they also indicate how incidentally and naïvely the Fathers used such weapons, not taking the trouble to differentiate one form from the other, though they could not have been ignorant of such distinctions.
The first thing that strikes one's attention in this examination of the use of the theistic argument in the early Christian writers is, as has been indicated, the paucity of examples. When we consider the emphasis laid upon this subject in the contemporaneous philosophical schools; the constant appeal to one form or another of the argument by Stoic and Epicurean alike; the various combinations and adaptations made by Eclectics and Syncretists; the use of such material in the exercises of the rhetorical instruction then so prominent in education; it would seem that a weapon so ready to their hand must have been seized upon by the Fathers, and made full use of for the advancement of the cause in which they were enlisted. And this silence on their part cannot be due to ignorance of what had been written on the subject, or of what was going on in the world about them. The patristic writings show the keenest interest in, and fullest knowledge of what men were thinking about in the outside world as well as within the Church. Many of the Fathers, as we have had occasion to notice, had been trained in the philosophical schools,[83] and show themselves fully conversant not only with such subjects, but with poetry and general literature as well.[84] In the course of their education, as well as in their reading, they must have become fully acquainted with all the forms of the theistic argument. And this knowledge they had every opportunity to use. Many of their works that have come down to us are either apologies or else answers to critics of Christianity, who attacked its doctrines from the stand-point of either polytheism or atheism. In maintaining the Christian doctrine of God against these opponents, the theistic argument would seem to be a most natural weapon for one who was confident of its validity. But the fact is, that in most of these apologies no such reasoning is employed, and even when it is to be found in their pages, is only incidental and by way of illustration, to explain the rational character of the Christian doctrine of God by a sort of argumentum ad hominem.
One reason for this neglect of the theistic argument may be readily found in the subject-matter of the treatises themselves. Almost exclusively with the earlier Fathers, as we have seen, and very largely with their successors, the emphasis was laid on life, rather than on thought, and the appeal was to authority rather than to reason. Men were asked to judge of Christianity by its fruits, and to receive the faith which it professed, not because of its rational demonstration, but because of the authority of Him who promulgated it. The persons to whom the arguments were addressed, too, explain much of the silence of the Fathers. To the Jew or religious Gentile it would be superfluous to address elaborate arguments to prove the existence of God, and it was to these classes that many of the works under discussion were addressed. To them the argument, such as we frequently find, from the Old Testament types and prophecies, or from the superior beauty and morality of the Christian doctrine and life, taking for granted the existence of God, was what the case required. And when, as is very frequently the case, they address the popular idolaters, it is a negative argument to show the unworthiness of idol-worship, and the superiority of their own doctrine, of which they naturally make use, and not a theistic argument which would have no significance to those who were already "too religious."
Many of the apologies of the early Church were called forth by the attacks which were made on the Christians by the adherents of the popular religions. The charges usually brought against them were those of atheism, because of their rejection of the gods of Greece and Rome; of immorality, because of the secrecy and mystery of their meetings, and cannibalism, because of their doctrine of the partaking of the Body and Blood of Christ in the Eucharist. In refuting these charges, especially the first, no place was afforded for the use of a theistic argument, but they naturally exhibit their belief in God as superior to that of their accusers, and appeal to their lives as justifying their belief.
But aside from these cases in which the theistic argument would have been superfluous, there are many places in which it is conspicuous for its absence. That they had other arguments besides those from scripture and authority, and that they believed in using them when necessary, we have, as we have seen, many proofs in their writings. Their position is well indicated by Lactantius, who blamed St. Cyprian for using a Scripture argument to an unbeliever,[85] and we shall be obliged to look deeper than mere ignorance or lack of occasion to account for the paucity of cases in which they use the argument for the existence of God.
The fact is that the history of Greek thought had shown conclusively the absolute futility of any efforts to arrive at a certain proof of the existence of God by purely rational methods. The attempts of each school to attain such certainty were repudiated by their successors, and even by their contemporaries; and the later trials—which the religious instincts and aspirations of men would not permit them to forego, even when they were sceptical of obtaining any valid and positive results—frequently became, instead of a sincere seeking after God, mere practice in the art of Rhetoric. And not only was it true that no one of the forms of the theistic argument brought conviction to any other mind than that of the man who regarded it with the partial enthusiasm of an originator or formulator, but even such an one was led to only the most vague and indefinite results. We have already seen how even the best theology of the Greeks led to nothing but a sort of organized or unified polytheism. A vague, fanciful first cause of physical phenomena, a general idea, abstracted out of all content, so as to leave no meaning for the human mind—whatever the imagination might make of it—a mechanical, magnetic force, to which all motion might conveniently be referred; a deified principle of order—and these held in conjunction with the popular polytheism, and impregnated with the national pantheistic conceptions—was all that Greek philosophy could offer to the higher religious aspirations of the educated man. The opinion of the Greek mind itself as to the character of the knowledge of God, to which the thought of their race had led them at the beginning of the Christian era was fitly expressed by those Athenians, who erected near the Areopagus the "altar on which was written, 'To the Unknown God.'"[86] The opinion (for in most cases it did not amount to a conviction) that there was an Unknown (or even, as many thought, an Unknowable) Divinity of some sort, which might account for the phenomena of the world, and which might be the truth behind the vagaries of the anthropomorphic polytheism, was as far as Greek thought had led men at the period with which we have to do. Their θεός was really nothing more than Mr. Herbert Spencer's "Unknowable,"—a mysterious "force," to which everything was referred which could not be accounted for on the basis of scientific principles.
Now if this was the case with the adherents of the heathen philosophical schools, how must the realization of the poverty of this result, and the distrust of the means which led to it, have been emphasized by the conversion of individuals from them to Christianity. It is a graphic picture which some of the Fathers paint for us of their eager search, in the different schools in turn, for some religious truth which would bring with it conviction; of their disappointment and consequent despair and scepticism, and then of the satisfaction which they had found for their aspirations in the teaching of Jesus Christ, who, they were convinced, was the very Word of God. Viewed merely from the historical point of view, this process is full of interest as illustrating that which was going on in many minds that stopped at the sceptical stage, and, for one reason or another, never found refuge in the Christian Church. But for those who did take this step, their former distrust of the theistic argument, as a basis for religious conviction, must have been greatly emphasized. The contrast between their former scepticism as to man's ability to attain to any knowledge of things beyond the phenomenal world, and their present faith and conviction which their belief in the Person of Christ gave them, must have made the part of any such means of arriving at truth as the already discredited theistic argument most insignificant. They, themselves, had no need for it. All it had been able to do for them, as for those to whom they wrote, was to raise an aspiration which "would not down"—to bring them to the hypothesis (substituted for polytheism, now outgrown) of an "Unknown God," and they felt that their message to their contemporaries was, like that of St. Paul to the Athenians on Areopagus: "Whom, therefore, ye ignorantly worship, Him declare I unto you."