Finished reading the book and here are two quotes from the book:
“God does not work through big battalions, He is not interested in numbers; He is interested in purity, in holiness, in vessels fit and meet for the Master’s use.” – D. Martyn Lloyd-Jones
“It is still true to say that no one knows, the world does not know, what God can do when one man is completely committed to Him.” – D. Martyn Lloyd-Jones