4. He professes a dependence upon God for the mercy of rain, which they were now in want of, v. 22. If they have forfeited their interest in him as their God in covenant, yet they will not let go their hold on him as the God of nature. (1.) They will never make application to the idols of the heathen, for that would be foolish and fruitless: Are there any among the vanities of the Gentiles that can cause rain? No; in a time of great drought in Israel, Baal, though all Israel presented their prayers to him in the days of Ahab, could not relieve them; it was that God only who answered by fire that could answer by water too. (2.) They will not terminate their regards in second causes, nor expect supply from nature only: Can the heavens give showers? No, not without orders from the God of heaven; for it is he that has the key of the clouds, that opens the bottles of heaven and waters the earth from his chambers. But, (3.) All their expectation therefore is from him and their confidence in him: "Art not thou he, O Lord our God! from whom we may expect succour and to whom we must apply? Art thou not he that causest rain and givest showers? For thou hast made all these things; thou gavest them being, and therefore thou givest them law and hast them all at thy command; thou madest that moisture in nature which is in a constant circulation to serve the intentions of Providence, and thou directest it, and makest what use thou pleasest of it; therefore we will wait upon thee, and upon thee only; we will ask of the Lord rain, Zech. x. 1. We will trust in him to give it to us in due time, and be willing to tarry his time; it is fit that we should, and it will not be in vain to do so." Note, The sovereignty of God should engage, and his all-sufficiency encourage, our attendance on him and our expectations from him at all times.