Edwards on the Trinity

John Piper in his book Think: The Life of the Mind and the Love of God quotes Jonathan Edwards essay on the Trinity.

This I suppose to be the blessed Trinity that we read of in the Holy Scriptures. The Father is the deity subsisting in the prime, unoriginated and most absolute manner or the deity in its direct essence. The Son is the deity generated by God’s understanding, or having an idea of Himself and subsisting in that idea. The Holy Ghost is the deity subsisting in act, or the divine essence flowing out and breathed forth in God’s infinite love to and delight in Himself. And I believe the whole in God’s infinite love to and delight in Himself. And I believe the whole Divine essence does truly and distinctly subsist both in the Divine idea and Divine love, and that each of them are properly distinct persons.

Further on in the chapter Piper quotes Edwards again:

God is glorified within Himself these two ways: (1) By appearing…to Himself in His own perfect idea [of Himself], or in His Son, who is the brightness of His glory. (2) By enjoying and delighting in Himself, by flowing forth in infinite…delight towards Himself, or in his Holy Spirit. …So God glorifies Himself toward the creatures also in two ways: (1) By appearing to…their understanding. (2) In communicating Himself to their hearts, and in their rejoicing and delighting in, and enjoying, the manifestations which He makes of Himself…God is glorified not only by His glory’s being seen, but by its being rejoiced in. When those that see it delight in it, God is more glorified than if they only see it. His glory is then received by the whole soul, both by the understanding and by the heart. God made the world that He might communicate, and the creature receive, His glory; and that it might [be] received both by the mind and heart. He that testifies his idea of God’s glory [doesn't] glorify God so much as he that testifies also his approbation of it and his delight in it.