What does Psalm 65:9 mean?
God generously sends rain to enrich the soil. Since the dawn of creation, God has cared for His creations on earth (Genesis 2:6, 10). That includes providing water to make the land productive in growing plants. This benefits human crops, such as grains (Genesis 27:28). God told the people of Israel that He would bless their land if the people obeyed Him. Deuteronomy 11:13–14 promises: "If you will indeed obey my commandments that I command you today, to love the LORD your God, and to serve him with all your heart and with all your soul, he will give the rain for your land in its season, the early rain and the latter rain, that you may gather in your grain and your wine and your oil."This psalm referred to people waiting to praise God, anticipating His provision and good works (Psalm 65:1–5). David may have written these words in response to an excellent harvest. Or, as a prayer in advance of the harvest season. Even though man plants seeds, it is ultimately the Lord who makes those crops grow (1 Corinthians 3:7).
Psalm 65:9–13 closes the song with a focus on God's providential care of the earth and gracious provision for mankind. The Lord faithfully prepares the earth for harvest. Evidence of His goodness is clearly seen in nature (Romans 1:18–20; Psalm 19:1). Likewise, the Lord should be given credit for what farms and fields produce (1 Corinthians 3:7). This passage seems a straightforward praise to the Lord for good crops. At the same time, this passage foreshadows the eternal, spiritual blessings which come through God's grace (John 4:36; James 3:18; Galatians 6:8).
David begins by anticipating praise to the Lord, expecting that He will bring atonement, fellowship, and blessing. The psalm mentions God's miraculous examples before referring to various natural examples of His provision. These benefits are both visible and available to all people of the world.