1. Exchange your strength with Divine strength: Isaiah 40:29-31 teaches that Almighty God Whom we worship and serve will give us strength when we are weak. When we lack might, He will give us power. He will give us health and strength to serve Him. Even young people may grow weary and tired and vigorous young men may get exhausted in trying to serve the Lord. But those who wait on the Lord, no matter what their age, will gain new strength. What a wonderful promise! And when young people are collapsing, these older men “who wait on the Lord will mount up with wings like eagles. They will run and won’t get tired. They will walk and they will never become weary”. I want to encourage everyone to learn to wait upon the Lord in simple trust for all your needs. You will gain new strength, as this verse says. Or as another translation puts it: “Those who wait on the Lord will exchange their strength”. That means that we give our human strength to the Lord and He gives us His Divine strength in exchange! Hallelujah!! It is wonderful to exchange everything we have with the Lord. Jesus told the Father, “All that I have is Yours, Father. And all that You have is mine” (John.17:10, 11). In the Lord’s service you need the Lord’s strength to see you through. All those who serve the Lord really need to trust the Lord to give supernatural strength from above, His resurrection power – not only in our spirit but in our bodies too. Then we will bear fruit for Him even in old age (Psa. 92:14).