Isaiah 40:28–31

Haven’t you known? Haven’t you heard? The everlasting God, the LORD, the Creator of the ends of the earth, doesn’t faint. He isn’t weary. His understanding is unsearchable. He gives power to the weak. He increases the strength of him who has no might. Even the youths faint and get weary, and the young men utterly fall; but those who wait for the LORD will renew their strength. They will mount up with wings like eagles. They will run, and not be weary. They will walk, and not faint.