New Defender's Study Bible Notes
17:28 in him we live. The God of creation sustains the very life of every person, even those who don’t believe He exists, so that “He [is] not far from every one of us” (Acts 17:27). Note also Colossians 1:17; Hebrews 1:3; etc.
17:28 poets. Paul here seems to be referring to Epimenides, Aratus and Cleanthes, each of whom seemed to have had some insight, however attained, into the fact that one supreme God had created all men. We are all the “offspring” (Greek genos) of God by creation (Malachi 2:10). This, of course, does not mean that all are children of God spiritually. This requires the new birth by faith in Christ (e.g., John 1:12-13).
17:29 Godhead. This is the first of three New Testament references to the “Godhead” (see also Romans 1:20; Colossians 2:9). Each translates a slightly different Greek noun, but all refer essentially to the “Godhood” of God—that is, the nature or structure of God, to God as He has revealed Himself. Since He has revealed Himself as a triune God (Father, Son, Spirit), the term has commonly been used to refer to the Trinity. In this verse, we are told that God can never be represented by an image or model which man can make, either with his hands or his mind. However, what man cannot do, God has done. That is, He has constructed a marvelous model of the Godhead in His creation. See notes on Romans 1:20.