Have you never heard or understood? Don't you know that the LORD is the everlasting God, the Creator of all the earth? He never grows faint or weary. No one can measure the depths of his understanding. He gives power to those who are tired and worn out; he offers strength to the weak. Even youths will become exhausted, and young men will give up. But those who wait on the LORD will find new strength. They will fly high on wings like eagles. They will run and not grow weary. They will walk and not faint.