Andrew Murray (May 9, 1828 – January 18, 1917) was a South African writer, teacher, and Christian pastor. Murray considered missions to be "the chief end of the church." (wikipedia.org)

Excerpt from the book:

The words, from which I want to present a simple message, will be found in the Gospel according to St. Luke, the 24th chapter and the 31st verse: "And their eyes were opened, and they knew Him." Some time since, I preached a sermon with the words "Jesus Himself" as the text; and as I went home I said to those who were walking with me: "How possible it is to have Jesus Himself with us and never to know it, and how possible to preach of, and to listen to, all the truth about Jesus Himself and yet not to know Him." I cannot say what a deep impression was made upon me as I thought over it.