Here is a passage I enjoyed.
Sometimes she was tempted to question her guidance. As she lifted up her eyes, and looked on the fields, and as calls began to come from South India, "could it be right to turn from so much that might be of profit and become just nursemaids?" It was then that she read the words from John 13, how the Lord of glory "took a towel and girded Himself". . . never again did she question whether her gifts were being wasted. She knew that the Master never wastes the servant's time.