2. What St. Paul teaches about the moral consciousness, and possibility of moral goodness, among the Gentiles has not a Jewish sound at all. The Jewish teachers generally would not have admitted any goodness acceptable to God in the heathen world. In fact, St. Paul is here, as in his speech at Athens, accepting the principle of a universal presence and operation of God in the human heart, outside the limit of any special revelation, and he accepts it in terms largely derived from current Stoic philosophy.
The Stoics, arising when the Greek city life was decaying, contemplated man as an individual, and undertook to show him how to lead a good life. A good life means a 'life according to nature,' or 'according to reason': the reason of the individual being a part of the universal reason or God. And as a help in living according to reason, the Stoics laid stress upon the conscience in each man, i.e. a faculty lying behind his ordinary surface self, passing judgement according to reason upon his actions, and 'making cowards of us all,' inasmuch as we all do wrong.
'No one,' said Seneca, St. Paul's contemporary, 'will be found who can acquit himself; and any man calling himself innocent has regard to the human witness, not to his own conscience.' He quotes an 'admirable saying of Epicurus,' 'The beginning of safety is the knowledge of sin.' He inculcates the duty of strict self-examination, and tells us how he performed it himself at night: 'when the light is removed, and my wife, who is by this time aware of my practice, is now silent, I pass the whole of my day under examination.' Then he 'opens out his conscience to the gods.' And this conscience is to every man a sort of inward God[6]. It is in fact the representative in each man of the universal, immutable, and divine moral law, the law of nature, in conformity with which is the only true freedom and citizenship of the world. 'For this' (the world of the moral order), said another contemporary of St. Paul, also a philosopher, 'is the common home of all, and its law is no written document (letter), but God. And if a man transgresses what the law imposes, he will be impious; or rather he will not dare transgress, for he could not escape. Justice has many furies, watch-dogs for sins[7].' There is in Cicero's Republic a magnificent expression of the principle of the law of nature: 'There is a true law which is right reason, agreeable to nature, diffused among all men, constant, eternal, which calls us to duty by its injunctions, and by its prohibitions deters us from wrong; which upon the good lays neither injunction nor prohibition in vain; while for the bad, neither its injunctions nor its prohibitions avail at all. This law admits neither of addition nor subtraction nor abrogation. The vote of neither senate nor people can discharge us from our obligation to it. We are not to look for some other person to expound or interpret it; nor will there be one law for Rome and another for Athens, nor one at this date and another later on; but one law shall embrace all races over all time, eternal and immortal; and there shall be hereby one common master and commander of all—God, who originated this law and proposed it and arbitrates concerning it; and if any one obeys it not, he shall play false to himself and shall do despite to the nature of man, and by this very fact shall pay the greatest penalties, even if he should escape all else that is reckoned punishment.' It is of interest to notice that the words cited by St. Paul before the Areopagus[8], 'We are also God's offspring,' occur in a hymn of the Stoic Cleanthes, full of the thought of man's relation through his reason to the universal and divine law.
Of this type of thought and language then St. Paul avails himself, in spite of the immense differences which disclose themselves below the surface between the Stoic and the Christian ideas of God. He avails himself of Stoic phraseology about men being God's offspring in his speech at Athens, as being in accordance with what he, the Christian apostle, had to teach. And here he adopts in substance the Stoic language with regard to conscience. As by inference from nature all men can know of God's power and divine attributes, so, St. Paul says, from the witness of conscience they may know the principles of His moral government[9]. St. Paul, however, rightly refuses to be satisfied with the individual conscience. The social judgement—the social verdicts of condemnation or acquittal continually being passed—co-operate with it to anticipate the judgements of God. And in virtue of the inward light of reason, and the conscience[10] both individual and social, he held that men who lie outside the region of special revelation can possess the moral law in effect in their hearts, and, it is implied, can keep it.
St. Paul is mainly occupied in this epistle in contrasting the Christian Church, as a region where spiritual power is given in response to faith to enable a man to fulfil the divine law, both with the heathen world, plunged in moral wickedness, and with the Jewish Church in its failure to attain to divine righteousness by the law of works—of which more hereafter. But there were among the Jews true sons of Abraham: and there were among the Gentiles good men acceptable to God, like righteous Job. St. Paul does not theorize about this. But there is at least no reason to deny that he would have declared these righteous men to be justified by faith and sanctified by grace, i.e. justified by that degree of truthful correspondence with God which was possible for them; and kept in harmony with the will of God by His Spirit. There is no reason to believe that St. Paul would not have admitted some action of faith and grace among the non-christian Gentiles, as he undoubtedly does among the prae-christian Jews who lived under or before the law. When he says of the good heathen that they do 'by nature the things contained in the law,' he uses the expression not as equivalent to 'by their own unassisted powers, without the help of God,' but simply to mean 'without the help of any special revelation[11].'
Universally then, according to St. Paul, two sources of the knowledge of God exist; nature, with its evidences of the divine power and other similar attributes, and conscience, with its witness to divine righteousness. And, though the sciences of nature and man have grown since St. Paul's day past recognition, nothing (we may boldly say) has really weakened either element of this double witness. It is, and remains true, that the only reasonable argument from the universal order of nature is to a universal reason or mind: and that the method by which the moral conscience may be believed to have developed out of 'animal intelligence,' makes no difference as to the cogency of its witness to a divine righteousness, in response to which alone it could have developed as in fact it has done. It is worth notice also before we leave this part of our subject, that St. Paul's line of thought affords a true explanation of the double fact that, on the one hand, the actual moral standards with which the conscience of different individuals, races, and generations is satisfied, greatly varies; and, on the other hand, that all the standards tend towards unity in a common idea of righteousness. The tendency towards unity St. Paul would attribute to the divine righteousness which lies behind conscience and which it exists to reflect. The variations would be due to the different degrees of development reached; or still more to the different degrees of faithfulness or unfaithfulness, attention or inattention, with which the conscience of the race or the individual has responded to the light. The conscience, like the speculative reason, is an instrument for coming to the truth; but an instrument capable of every variety of racial or individual error or obtuseness.
3. It appears clearly enough in this chapter, that St. Paul's doctrines of free grace and justification by faith must be grossly and carelessly misconceived unless they are viewed upon a deep background of what we commonly call 'natural religion,' that is (practically) the religion that appeals straight off to the conscience of almost all honest and civilized men. It is 'natural