It is undoubtedly many things, material and immaterial. But what is at the heart of God's blessing? Can we see a center? I will not try to support my claim here with a comprehensive exposition of Scripture. However, I will assert that the answer is: Yes, there is a center to God's blessing. Search the Scriptures for yourselves, and see whether what I claim here is so, O Noble-minded Berean. I'll only cite one text.
In Psalm 133:3 we have our answer—it is life forevermore! It is not lots of American goodies for our three score and ten. On the mountains of Zion YHWH has commanded his blessing—eternal life! So when you think of, and pray for, God’s blessing, think of the life of God. God’s supreme blessing is the giving of life evermore in his Son, imparting his Spirit, the Spirit of eternal life.