The Fullness of the Godhead

Edwards:

Now God's internal glory, is either in his understanding or will. The glory or fullness of his understanding is his knowledge. The internal glory and fullness of God, having its special seat in his will, is his holiness and happiness. The whole of God's internal good or glory, is in these three things, viz. his infinite knowledge, his infinite virtue or holiness, and his infinite joy and happiness.  

Indeed there are a great many attributes in God, according to our way of conceiving them: but all may be reduced to these; or to their degree, circumstances, and relations. We have no conception of God's power, different from the degree of these things, with a certain relation of them to effects. God's infinity is not properly a distinct kind of good, but only expresses the degree of good there is in him. So God's eternity is not a distinct good; but is the duration of good. His immutability is still the same good, with a negation of change. So that, as I said, the fullness of the Godhead is the fullness of his understanding, consisting in his knowledge; and the fullness of his will consisting in his virtue and happiness.

—John Piper, God's Passion for His Glory: Living the Vision of Jonathan Edwards (Wheaton: Crossway, 1998), 243–244.