Galatians 6:9-10 MSG
[9-10] So let's not allow ourselves to get fatigued doing good. At the right time we will harvest a good crop if we don't give up, or quit. Right now, therefore, every time we get the chance, let us work for the benefit of all, starting with the people closest to us in the community of faith.
Fatigue is defined as extreme tiredness, typically resulting from mental or physical exertion or illness. Experiencing chronic fatigue is to push the body from tiredness to complete exhaustion with the inability to perform normal duties and task. Cumulative fatigue on the other hand is a form of fatigue that comes from repetitive exertion. It's affects are usually over a extended period of time. Chronic fatigue causes you to slow down almost to a stop. Cumulative fatigue is gradually increasing fatigue caused by previous spurts of exertion.
There are signs and symptoms of fatigue in the body of Christ, both chronic and cumulative. Those suffering from fatigue have lost their zeal. They have become so exhausted that they have lost sight of the passion they once had. There are many that start their walk of faith with great zeal for the things of God and the work of the ministry but become worn down by religion. The image of being religious has become more important than the relationship that leads to righteousness.
Chronic fatigue plagues the body of Christ as a result of seeking to either please ones own's desires or man's. You were created by God for His good pleasure not man's. We are to serve with a servant's hearts but we belong to only one master, Christ Jesus . Many have become fatigue as they lack understanding of their relationship with Christ and their position in the body of believers. This loss of focus causes you to become weary when results are not seen or appreciation for their efforts are not given. The motive of the heart becomes adjusted; desiring to receive validation. Paul says:
Philippians 3:13-14 KJV
 Brethren, I count not myself to have apprehended: but this one thing I do , forgetting those things which are behind, and reaching forth unto those things which are before,  I press toward the mark for the prize of the high calling of God in Christ Jesus.
Paul was aware that the prize the we seek is not man's to give but it is God's. Therefore it is found in serving Him.
Cumulative fatigue in the world of athletes has been used to train the body to push past it's breaking point. It has become a tool used to build stamina. How could fatigue possibly be resourceful? It depends on your perspective and your confession. Have you ever wondered why some could go through the most difficult and trying times but they never give up ? They may slow down but they are back at again. These people seem to handle whatever difficulty comes there way. They have a faith the propels them through their challenges to become successful even ing the mist of failure. As a matter of fact, they look like they are growing stronger spiritually. Why? Is it possible that there action indicate that their confession is:
Romans 8:28 KJV
 And we know that all things work together for good to them that love God, to them who are the called according to his purpose.
Could it be that the cares of this world can truly work together for our good? If you use it as a tool to build stamina instead of an excuse to stumble back or quit. Understand that God's design includes you, that's why you are here. He has a purpose and a plan for your life. He wants to be glorified through your imperfections.
Circumstances are only temporary. Use them increase your faith. Right when you think you have nothing left to give... PUSH yourself to exercise faith. Build your faith muscles.
Don't allow yourself to become entangled with the affairs of this world that you loose focus. And if you have, it okay. God's grace is continual and his mercies are new every morning. Just adjust yourself your focus, your prospective, your confession. Know that as you press towards the "mark for the prize of the high calling" challenges may come. But "all things work together for good".