Isaiah 40:31 “But they that wait upon the LORD shall renew their strength; they shall mount up with wings as eagles; they shall run, and not be weary; and they shall walk, and not faint.”
There is never a power shortage with God. He always has the power to accomplish any work of faith that a believer sets out to achieve. Verse 28 says, “Hast thou not known? hast thou 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.” God is reminding us in this verse that He never gets weary of helping, He never quits helping the believer who serves Him, and He always has the power to help them if they continue.
Verse 31 shows the believer that they can be like the LORD who never gets weary or faints. The verse above says, “But they that wait upon the LORD shall renew their strength…” It is interesting that nowhere does this verse say that the LORD renews the strength of those who serve Him, but they renew their strength by serving Him. In other words, the renewing of strength is found in the person who needs their strength renewed. To renew means to resume, pick up again, carry on, regenerate, revive, or refill. In other words, something caused the believer to lose their strength, but they can renew it by simply waiting or serving the LORD. How does the believer renew their strength?
First, they “mount up with wings as eagles.” The phrase “mount up” means to go up or increase. God is teaching that faith is the first step to renewing your strength. You will never find your strength invigorated by living a faithless life. In fact, the faithless life will take your spiritual strength from you. Faith has a way of reinvigorating the believer’s strength. Faith is exciting and gives a great new vision; thus, it renews or revives the strength to do something for the LORD.
Second, renew your strength by running. Faith is nothing if you don't run with it. In other words, step out and start running in service. There is something about getting busy that excites you as a believer. Those who are sitting will always be weary of the Christian life. Being a spectator instead of a participant in the Christian race will never cause the race to seem exciting. Those who run by soul winning, teaching Sunday school classes, running busses, or serving in the ministry to reach others always find their strength for serving the LORD never wains because action invigorates the believer.
Third, God then says the believer shall walk. In other words, you can run in serving God, but you will faint if you don’t slow down daily to walk with God in a personal time with Him. Yes, you need to run, but you must slow everything down to walk with Him in His Word and in prayer to get the strength to run again. Walking without running makes walking needless. Running without walking will leave you empty of strength, which will cause you to become weary and faith.
Fourth, don't give up. Quitting must never be an option. You will find your strength renewed if you decide not to quit running in service or walking daily with God; however, you will become weary and quit IF you stop running and walking.
It all starts with choosing to wait upon the LORD. When your choice is to serve the LORD, you will never get tired of running for the LORD or become weary of walking with Him. When you choose to run for the LORD and walk with Him is when you will discover that He is altogether lovely.