In If Thou Wilt Be Perfect the author shows that reason has usurped the place of Christ's Spirit through many centuries. The quotations made by Oswald Chambers are themselves of great value, and the expository words that follow are full of luminous and practical teaching for us today.
Oswald Chambers (1874–1917) was a prominent preacher, writer, and evangelist. He studied at The Art School in South Kensington, the University of Edinburg, and Dunoon Training School.
Chambers served as a YMCA chaplain to British Commonwealth soldiers during World War I. He also worked as a traveling speaker for the League of Prayer and as the main teacher of the Bible Training College. His preaching ministry reached Britain, America, and Japan.