Read some of the current appeals for "Volunteers" in mission organization propaganda. Compare what they want in a "volunteer" with the description of a servant of the Gospel written years ago by C. F. W. Walther.
When a person wants to become a servant of the Gospel, he must be so disposed towards his Lord Jesus Christ as to be able to say to Him:
"My dear Lord Jesus, Thou art mine; therefore, I wish to be Thine. All that I possess, my body and my soul, my strength and my gifts, and all that I do, my entire life, shall be consecrated to Thee, to Thee alone. Lay on me any burden Thou pleasest, I shall gladly bear it. Lead me anywhere, through sorrow or joy, through good fortune or misfortune, through shame or honor, through favor of men or their disfavor, grant me a long life, or should I die an early death, – I shall be satisfied with anything. Lead the way, and I shall follow."