I have read Hudson Taylor's Spiritual Secret four or five times in my life. It is a book that is so good that it is worth diving into again and again just to remember what the Spirit of God will do in the life of a person surrendered to Him.
This quote has arrested me many times, and is worth sharing with you.
"But Hudson Taylor did not start out to impact "millions." He started out to love God, to honor Him, and to share His love with individual sinners who needed so desperately to know Him. Jesus called Taylor (and us) to be "faithful," not "successful." And God added the increase. So shall it be with us, I pray." (page 12)