A.B. Simpson emphasizes the importance of recognizing and embracing the specific roles God has assigned to each believer, suggesting that many Christians struggle with feelings of inadequacy and the belief that they are not pleasing God. He encourages believers to find joy and power in their service by faithfully filling their designated places, no matter how small or seemingly insignificant. Just as every part of a machine has its purpose, so does every Christian have a role in God's plan, and by accepting this, they can contribute meaningfully to His work. Simpson reminds us that even the smallest acts of service can have a profound impact, as everyone has something to offer.

Many Christians are in the place that the Lord has appointed them, and yet the devil is harassing their lives with a sense that they are not quite pleasing the Lord. If they could just settle down in the place that God has assigned them and fill it faithfully and lovingly for Him, there would be more joy in their hearts and more power in their lives. God puts us in various places to serve Him, and the secret of accomplishing the most is to recognize our place as designated from Him and our service in it as pleasing to Him. Even in the great factory or the complex machine there is a place for the smallest screw and rivet as well as the great driving wheel and piston. So God has His "small parts" whose business is simply to stay where He puts them and to believe that He wants them there and is making the most of their lives in the little spaces that they fill for Him. There is something all can do, Tho' you're neither wise nor strong; You can be a helper true, You can stand when friends are few, Some lone heart has need of you, You can help along.