What is a blessing? It can be explained with an example. A king planted trees in his garden. It may rain and water them, and the ground may be wet and provide them with moisture, but still, he must water them from the spring. It is thus written (Psalm 111:10), "The beginning is Wisdom, the fear of God, good intelligence to all who do them..." You may think that it lacks something. It is therefore written, "His praise endures forever."
Rabbi Amorai sat and expounded: What is the meaning of the verse (Deuteronomy 33:23), "The filling is God's blessing, possessing the Sea and the South"? Moses was saying, "If you follow my decrees, you will inherit both this world and the next." The World to Come is likened to the sea, as it is written (Job 11:9), "It is wider than the sea." The present world is referred to as the South. It is thus written (Joshua 15:19), "...for you have set me in the land of the south..." The Targum translates this, "behold the earth is the south."