33-41. He turneth rivers into a wilderness, &c.—God's providence is illustriously displayed in His influence on two great elements of human prosperity, the earth's productiveness and the powers of government. He punishes the wicked by destroying the sources of fertility, or, in mercy, gives fruitfulness to deserts, which become the homes of a busy and successful agricultural population. By a permitted misrule and tyranny, this scene of prosperity is changed to one of adversity. He rules rulers, setting up one and putting down another.