His fellow-collegians thought of him as a steady, religious-minded man, but not peculiarly devout, and indeed the just balance of his mind made him perceive that the prime duty of an undergraduate was industry rather than attempts to exercise his yet unformed and uncultivated powers. In 1848 he was second wrangler. There were two prizes, called Dr. Smith's, for the two most distinguished mathematicians of the year. The senior wrangler's papers had the first of these; for the second, Mackenzie was neck and neck with a Trinity College man, and the question was only decided by the fact that Dr. Smith had desired that his own college (Trinity) should have the preference.
After this he became tutor and fellow of his college, taking private pupils, and at the same time preparing for Holy Orders, not only by study of books, but by work among the poor, with whom his exceeding kindness and intense reality gave him especial influence at all times.
He was ordained on the Trinity Sunday of 1851, and took an assistant curacy at a short distance from Cambridge, his vigorous powers of walking enabling him to give it full attention as well as to his pupils and to the University offices he filled. His great characteristic seems always to have been the tenderest kindness and consideration; and in the year when he was public examiner, this was especially felt by the young men undergoing an ordeal so terrible to strained and excited intellect and nerves, when a little hastiness or harshness often destroys the hopes of a man's youth.
With this combination of pastoral work and college life Mackenzie was perfectly satisfied and happy, but in another year the turning-point of his life was reached. A mission at Delhi to the natives was in prospect, and the Rev. J. S. Jackson, who belonged to the same college with him, came to Cambridge in search of a fellow-labourer therein. During the conversations and consultations as to who could be asked, the thought came upon Mackenzie, why should he strive to send forth others without going himself. He could not put it from his mind. He read Henry Martyn's life, and resolved on praying for guidance as to his own duty. In the words of his letter to Mrs. Dundas, "I thought chiefly of the command, 'Go ye and baptize all nations,' and how some one ought to go; and I thought how in another world one would look back and rejoice at having seized this opportunity of taking the good news of the Gospel to those who had never heard of it; but for whom, as well as for us, Christ died. I thought of the Saviour sitting in heaven, and looking down upon this world, and seeing us, who have heard the news, selfishly keeping it to ourselves, and only one or two, or eight or ten, going out in the year to preach to His other sheep, who must be brought, that there may be one fold and one Shepherd; and I thought that if other men would go abroad, then I might stay at home, but as no one, or so few, would go out, then it was the duty of every one that could go to go. . . . And I thought, what right have I to say to young men here, 'You had better go out to India,' when I am hugging myself in my comfortable place at home." And afterwards, "Now, dear Lizzie, I have always looked to you as my mother and early teacher. To you I owe more than I can ever repay, more than I can well tell. I do hope you will pray for me and give me your advice."
Mrs. Dundas's reply to this letter was a most wise and full expression of sympathy with the aspiration, given with the deep consideration of a peculiarly calm and devotional spirit, which perceived that it is far better for a man to work up to his fullest perception of right, and highest aims, than to linger in a sphere which does not occupy his fullest soul and highest self; and she also recognized the influence that the fact of one of a family being engaged in such work exercises on those connected with them.
Others of the family, however, were startled, and some of his Cambridge friends did not think him adapted to the Delhi Mission, and this therefore was given up, but without altering the bent that his mind had received; and indeed Mrs. Dundas, in one of her beautiful letters, advised him to keep the aim once set before him in view, and thus his interest became more and more turned towards the support of missionary work at home.
In 1854, the first Primate of New Zealand, George Augustus Selwyn, visited England, after twelve years of labour spent in building up the Colonial and Maori Church, and of pioneering for missions in the Melanesian Isles, over which his vast see then extended. He preached a course of four sermons at Cambridge; Mackenzie was an eager listener, and those forcible, heart-stirring discourses clenched his long growing resolution to obey the first call to missionary labour that should come to him, though, on the other hand, he desired so far to follow the leadings of Providence that he would not choose nor volunteer, but wait for the summons-whither he knew not.
Ere long the invitation came. The erection of the colony of Natal into a Bishop's See had been decided upon a year before, and it had been offered to John William Colenso, a clergyman known as active in the support of the missionary cause, and a member of the University of Cambridge. On his appointment he had gone out in company with the Bishop of Capetown to inspect his diocese and study its needs, as well as to lay the foundations of future work. In the party who then sailed for Natal was a lady who had recently been left a widow, Henrietta Woodrow by name, ardent in zeal for the conversion of the heathen, and hoping that the warm climate of Africa would enable her to devote herself to good works more entirely than her delicate health permitted at home.
Pieter Maritzburg had by this time risen into a capital, with a strange mixture of Dutch and English buildings; but the English population strongly predominated. Panda was king of the Kaffirs, and fearfully bloody massacres had taken place in his dominions, causing an immense number of refugees to take shelter in the English territory. Young people who thus came were bound apprentices to persons who would take charge of them for the sake of their services, and thus the missions and those connected with them gained considerable influence for a time. A Kaffir, who must have been Captain Gardiner's faithful Umpondobeni, though he was now called by another name, inquired for his former good master, and fell into an agony of distress on hearing of his fate.
Mrs. Woodrow at once opened an orphanage for the destitute English children that are sure to be found in a new colony, where the parents, if unsuccessful, are soon tempted to drink, and then fall victims to climate and accident. The Kaffir servant whom she engaged had already been converted, and was baptized by the name of Abraham, soon after he entered her service; but "Boy,"-the name at first given to him,-became a sort of surname to him and to his family. While watching over the little band of children, Mrs. Woodrow was already-even though as yet only learning the language-preparing the way for the coming Church. She wrote of the Kaffirs: "They come to me of all ages, men and women, some old men from the country, with their rings upon their heads, and wrapped in their house blankets. Then they sit down on the kitchen floor, our 'Boy' telling them, in his earnest way, about JESUS CHRIST. These I cannot speak to, but I manage to let them know that I care for them, and 'Boy' says they go away with 'tears in their hearts.'"