He died in the early morning of 3rd January 1841. His son William thus describes the scene: "It was the first time any of us except our mother had looked on the face of the dying in the act of departing, and that leaves an impression that can never be effaced. When the end came, and each had truly realised what had happened, our mother in a broken voice asked that 'the Books' might be laid on the table; then she gave out that verse in the 107th Psalm—

'The storm is changed into a calm
At his command and will;
So that the waves that raged before,
Now quiet are and still.'

It was her voice, too, that raised the tune. Then she asked Thomas to read a chapter of the Bible and afterwards to pray. We all knelt down, and Thomas made a strong effort to steady his voice, but he failed utterly; then the dear mother herself lifted the voice of thanksgiving for the victory that had been won, and after that the neighbours were called in."[4]

Cairns was soon to have further experience of anxiety in respect to the health of those who were near to him. Towards the close of the year in which his father died, his brother William, who had almost completed his apprenticeship to a mason at Chirnside, in Berwickshire, was seized with inflammation, and for some weeks hung between life and death. At length he recovered sufficiently to be removed under his elder brother's careful and loving supervision to the Edinburgh Infirmary, where he remained for four months. During all that time Cairns visited his brother twice every day, he taught himself to apply to the patient the galvanic treatment which had been prescribed, and brought him an endless supply of books, periodicals, and good things to eat and smoke.

In the end of 1842 George Wilson was told by an eminent surgeon that he must choose between certain death and the amputation of a foot involving possible death. He agreed at once to the operation being performed, but begged for a week in which to prepare for it. He had always been a charming personality, and had lived a life that was outwardly blameless; but he had never given very serious thought to religion. Now, however, when he was face to face with death, the great eternal verities became more real to him, and during the week of respite the study of the New Testament and the counsel and sympathy and prayers of his friend Cairns prepared him to face his trial with calmness, and with "a trembling hope in Christ" in his heart. The two friends, who had thus been brought so closely together, were henceforth to be more to each other than they had ever been before.

The next year, 1843, was a memorable one in the ecclesiastical history of Scotland. Cairns, though not sympathising with the demand of the Non-Intrusion party in the Church of Scotland for absolute spiritual independence within an Established Church, had an intense admiration for Chalmers, and was filled with the greatest enthusiasm when he and the party whom he led on the great 18th of May clung fast to the Independence and left the Establishment behind them. Indeed his enthusiasm ran positively wild, for it is recorded that, when the great procession came out of St. Andrew's Church, Cairns went hurrahing and tossing up his hat in front of it and all the way down the hill to Tanfield Hall. To Miss Darling, who had no sympathy with the Free Church movement, he wrote: "I know our difference of opinion here. But you will pardon me for saying that I have never felt more profound emotions of gratitude to God, of reverence for Christianity, of admiration of moral principle, and of pride in the honesty and courage of Scotsmen, than I did on that memorable day."

In the autumn of this year he was able to carry out a project which he had had before him, and for which he had been saving up his money for a long time. This was the spending of a year on the Continent. It was by no means so common in those days as it has since become for a Scottish theological student to attend a German University. Indeed, until the early Forties of last century, such a thing was scarcely known. Then, however, the influence of Sir William Hamilton, and the interest in German thought which his teaching stimulated, created the desire to learn more about it at its source.

It is natural that this movement should have affected the students of the Secession Church before it reached those of the Establishment; for not only were they less occupied with the great controversy of the day and its consequences, but their short autumn session left them free to take either a winter or a summer semester, or both, at a German University without interrupting their course at home. The late Dr. W.B. Robertson of Irvine used to lay claim to having been the pioneer of these "landlouping students of divinity." John Ker and others followed him; and when Cairns set out in 1843, quite a large company of old friends were expected to meet at Berlin. Cairns's departure was delayed by the illness of James Russell, who was to have accompanied him, but he set out towards the end of October. He had accepted an appointment as locum tenens for four weeks in an English Independent chapel at Hamburg, which delayed his arrival at Berlin until after the winter semester had commenced. But this interlude was greatly enjoyed both by himself and by the little company of English merchants who formed his first pastoral charge, and who, on a vacancy occurring, made a strong but fruitless attempt to induce him to remain as their permanent minister.

Arrived in Berlin, he joined his friends—Nelson, Graham, Wallace, and Logan Aikman. With Nelson he shared a room in the Luisenstrasse, where they set up that household god of all German students—a "coffee-machine," with the aid of which, and some flaming spiritus, they brewed their morning and evening beverage. They dined in the middle of the day at a neighbouring restaurant, on soup, meat, vegetables, and black bread, at a cost of threepence.

At the University, Cairns heard four or five lectures daily, taking among others the courses of Neander on Christian Dogmatics, Trendelenburg on History of Philosophy, and Schelling, the last of the great philosophers of the preceding generation, on Introduction to Philosophy. Of these, Schelling impressed him least, and Neander most. Through life he had a deep reverence for Neander, whom he regarded, with perhaps premature enthusiasm, as the man who shared with Schleiermacher the honour of restoring Germany to a believing theology.