"_Cambridge, February_ 10, 1858.--MY DEAR SIR,--Your kind and very welcome letter came to me yesterday; and I take the first moment of leisure to thank you for it, and to send you a few more words of good-will, along with my prayers that God may, for many years, prolong your life and the lives of those who are most near and dear to you, and that he may support you in all coming trials, and crown with a success, far transcending your own hopes, your endeavors for the good of our poor humble fellow-creatures in Africa, "There is but one God, the God who created all worlds and the natural laws whereby they are governed; and the God of revealed truth, who tells us of our destinies in an eternal world to come. All truth of whatever kind has therefore its creator in the will and essence of that great God who created all things, moral and natural. Great and good men have long upheld this grand conclusion. But, alas! such is too often our bigotry, or ignorance, or selfishness, that we try to divorce religious and moral from natural truth, as if they were inconsistent and in positive antagonism one to the other,--a true catholic spirit (oh that the word 'catholic' had not been so horribly abused by the foul deeds of men!) teaching us that all truths are linked together, and that all art and science, and all material discoveries (each held in its proper place and subordination), may be used to minister to the diffusion of Christian truth among men, with all its blessed fruits of peace and good-will. This is, I believe, your faith, as I see it shining out in your deeds, and set forth in the pages of your work on Southern Africa, which I have studied through from beginning to end with sentiments of reverence and honor for the past and good hopes for the future. "What a glorious prospect is before you! the commencement of the civilization of Africa, the extension of our knowledge of all the kingdoms of nature, the production of great material benefits to the Old World, the gradual healing of that foul and fetid ulcer, the slave-trade, the one grand disgrace and weakness of Christendom, and that has defiled the hands of all those who have had any dealings with it; and last, but not least--nay, the greatest of all, and the true end of all--the lifting up of the poor African from the earth, the turning his face heavenward, and the glory of at length (after all his sufferings and all our sins) calling him a Christian brother. May our Lord and Saviour bless your labors, and may his Holy Spirit be with you to the end of your life upon this troubled world!