Hast thou not known? Hast though not heard, that the everlasting God, the Lord, the Creator of the ends of the earth, fainteth not, neither is weary? There is no searching of his understanding. He giveth power to the faint and to them that have no might he increaseth strength. Isaiah 40:28-29
There's nothing worse than to have a desire to do something and then be physically unable to perform. This incites frustration to the point where people adopt strategies to acquire more energy, be it through a healthier diet, rigorous exercise, vitamin supplements or energy drinks. These activities are done to increase the level of ability to perform daily functions or recreational activities.
Many cancer patients are aware of the fatigue the disease causes. In times of illness, one becomes very aware of waning strength and the inability to do as much as when the person is well. Having cancer not only takes away one's health, but it also affects one's energy level, taking away opportunities to perform desired tasks.
It's an awesome thing to know that God never tires or wearies. He is never depleted of strength as He continuously and independently maintains the world. He has strength to do all He desires. One thing He desires is to give power, or strength, to those without. There are times in our illnesses when we don't have the strength we need to accomplish the things demanded of us, moreover the ability to fulfill desires. But, our God will give strength generously to those who ask of him.
When we're tired, we simply can go to our Father, who will provide us with the strength we need. He provides all we need. He, our Healer, is able to restore our strength and energy where we can again do the things we most enjoy. He also can send others to help us perform our daily activities. These helpers become the hands and feet of God in providing for the needs of His loved ones.
I suspect a look around will reveal the strong hand of God in our lives. Strength provided by God may resemble individuals preparing a meal or a friend's companionship to a doctor's visit or someone even helping with household chores like laundry. It's through others providing their time and efforts that God extends his arms of strength.
We've all heard there's strength in numbers. Community is a great example of this truth as needs are being met and feelings of acceptance are present. Such kinship relationships foster strength for individuals by their knowing that another is there to help. These helpers are to be reminders of God’s ever-present strength which He provides to all in times of weakness.
To the faint, God working in others -- community -- is strength.