It was to the ministry, as thus understood, that Cairns had devoted himself at the close of his University course and again just before he took license as a probationer, when for a short time, as we have seen, he had been drawn aside by the attractions of "sacred literature." He never thought of becoming a minister and was putting his main strength into philosophy and theology. Not that he now forswore all interest in either, but from the moment of his final decision, he had determined that the mid-current of his life should run in a different direction.
Yet another important factor in the case is to be found in the circumstances of his Berwick ministry. Had his lot been cast in a quiet country place, with only a handful of people to look after, the great book might yet have been written. But he had to attend to a congregation whose membership was at first nearly six hundred, and afterwards rose to seven hundred and eighty and, with his standard of pastoral efficiency, this left him little leisure. Indeed it is wonderful that, under these conditions, he accomplished so much as he did—that he wrote his North British articles, maintained a reputation which won for him so many offers of academic posts, and at the same time laid the foundation of a vast and spacious learning in Patristic and Reformation theology. Akin to his strictly ministerial work, and flowing out of it, was the work he did for his Church as a whole—the share he took in the Union negotiations with the Free Church during the ten years that these negotiations lasted, and the endless round of church openings and platform work to which his growing fame as a preacher and public speaker laid him open.
But there is one other consideration which, although it is to some extent involved in what has already been said, deserves separate and very special attention. Although his friends and the public regretted his withdrawal from the speculative field, it is not so clear that he regretted it himself. He had, it is true, worked in it strenuously and with conspicuous success, and had revealed a natural aptitude for Christian apologetics of a very high order. But it does not appear that either his heart or his conscience were ever fully engaged in the work. He never seemed as if he were fighting for his life, because he always seemed to have another and an independent ground of certainty on which he based his real defence. There is a passage in his Life of Clark which bears upon this point so closely that it will be well to quote it here:—
"The Christian student is as conscious of direct intercourse with Jesus Christ as with the external world, or with other minds. This is the very postulate of living Christianity. It is a datum or revelation made to a spiritual faculty in the soul, as real as the external senses or any of the mental or moral faculties, and far more exalted. This living contact with a living person by faith and prayer is, like all other life, ultimate and mysterious, and must be accepted by him in whom it exists as its own sufficient explanation and reason, just as the principles of natural intelligence and conscience, to which it is something superadded, and with which, in this point of view, though in other respects higher, it is co-ordinate. No one who is living in communion with Jesus Christ, and exercising that series of affections towards Him which Christianity at once prescribes and creates, can doubt the reality of that supernatural system to which he has been thus introduced; and nothing more is necessary than to appeal to his own experience and belief, which is here as valid and irresistible as in regard to the existence of God, of moral distinctions, or of the material world. He has no reason to trust the one class of beliefs which he has not, to trust the other.... To minds thus favoured, this forms a point d'appui which can never be overturned—an aliquid inconcussum corresponding to the 'cogito ergo sum' of Descartes. Their faith bears its own signature, and they have only to look within to discover its authenticity. Philosophy must be guided by experience, and must rank the characters inscribed on the soul by grace at least as sacred as those inscribed by nature. Such persons need not that any man should teach them, for they have an unction from the Holy One; and to them applies the highest of all congratulations: 'Blessed art thou; for flesh and blood hath not revealed it unto thee, but My Father which is in heaven.'"[12]
These words contain the true explanation of Cairns's life. There was in it the "aliquid inconcussum"—the "unshaken somewhat"—which made him independent of other arguments, and which kept him untouched by all the intellectual attacks on Christianity. Other people who had not this inward testimony, or who, having it, could not regard it as unshaken by the assaults of infidelity, he could argue with and seek to meet them on their own intellectual ground; but for himself, any victories gained here were superfluous, any defects left him unmoved. Was it always so with him? Or was there ever a time when he was carried off his feet and had to struggle for dear life for his Christian faith amid the dark waters of doubt?
There are indications that on at least one occasion he subjected his beliefs to a careful scrutiny, and, referring to this later, he spoke of himself as one who, in the words of the Roman poet, had been "much tossed about on land and on the deep ere he could build a city." This, coming from one who was habitually reticent about his religious experiences, may be held as proving that there was no want of rigour in the process, no withholding of any part of the structure from the strain. But that that structure ever gave way, that it ever came tumbling down in ruins about him so that it had to be built again on new foundations, there is no evidence to show. The "aliquid inconcussum" appears to have remained with him all through the experience. This seems clear from a passage in a letter written in 1848 to his brother David, then a student in Sir William Hamilton's class, in which he says; "I never found my religious susceptibilities injured by metaphysical speculations. Whether this was a singular felicity I do not know, but I have heard others complain."[13]
This, taken in conjunction with the passage quoted above from Clark's Life, in which it is hard to believe that he is not speaking of himself, seems decisive enough, and in a mind of such speculative grasp and activity it is remarkable. "Right down through the storm-zone of the nineteenth century," writes one who knew him well, "he comes untroubled by the force of the 'aliquid inconcussum.' Edinburgh, Germany, Berwick; Hamilton, Kant, Hegel, Strauss, Renan, it is all the same. The cause seems to me luminously plain. Saints are never doubters. His religious intuitions were so deep and clear that he was able always to find his way by their aid. They gave him his independent certainty, his 'aliquid inconcussum.'"
His influence on the religious life of his time was largely due to the spiritual faculty in him that is here referred to. He was the power he was, not so much because of his intellectual strength as because of his character,—because he was "a great Christian." But in this respect he had the defects of his qualities; and it is open to question whether he ever truly appreciated the formidable character of modern doubt, just because he himself had never had full experience of its power, because the iron of it had never really entered into his soul.
George Gilfillan, who, with all his defects, had often gleams of real insight, wrote thus in his diary 14th January 1863: "I got yesterday sent me, per post, a lecture by John Cairns on 'Rationalism, Ritualism, and Pure Religion,' or some such title, and have read it with interest, attention, and a good deal of admiration of its ability and, on the whole, of its spirit. But I can see from it that he is not the man to grapple with the scepticism of the age. He has not sufficient sympathy with it, he has not lived in its atmosphere, he has not visited its profoundest or tossed in its stormiest depths. Intellectually and logically he understands it as he understands most other matters, but sympathetically and experimentally he does not."
There is a considerable amount of truth in this, although it is lacking somewhat in the sympathy which the critic desiderates in the man he is criticising. Cairns did not feel that the battle with modern doubt was of absolutely overwhelming importance, and this, along with the other things to which reference has been made, kept him from giving to the world that new statement of the Christian position which his friends hoped to get from him, and which he at one time hoped to be able to give.