“But those who wait on the LORD shall renew their strength; they shall mount up with wings like eagles, they shall run and not be weary, they shall walk and not faint.”
The word renew, in Hebrew, literally means to exchange strength. In the context of this verse, Isaiah was saying God’s people shall exchange their strength. The Christian life is an exchanged life. Have you ever taken a Christmas present back to the store to exchange it? Similarly, we are to take our so-called strength, which is actually weakness, and exchange it for God’s strength. Those who wait upon the Lord shall exchange their strength. I give Him my strength, which is really weakness—for the weakness of God is stronger than men—and God gives His strength to me as an exchange. It’s the same thing the apostle Paul talked about in Galatians 2:20: “I have been crucified with Christ; it is no longer I who live, but Christ lives in me; and the life which I now live in the flesh I live by faith in the Son of God, who loved me and gave Himself for me.” That is more than a changed life; it is an exchanged life.
Go for a walk today, prayerfully considering the areas in which you are not waiting on the Lord but are instead seeking to work in your own strength. Ask Him to help you exchange your strength for His.