Commentaries:
Robertson's Word Pictures (NT)
That quickeneth (to zwopoioun). Articular present active participle of zwopoiew for which see John 5:21. For the contrast between pneuma (spirit) and sarc (flesh) see already John 3:6.
The words (ta rhmata). Those in this discourse (I have just spoken, lelalhka), for they are the words of God (John 3:34; John 8:47; John 17:8). No wonder they "are spirit and are life" (pneuma estin kai zwh estin). The breath of God and the life of God is in these words of Jesus. Never man spoke like Jesus (John 7:46). There is life in his words today.
Other Robertson's Word Pictures (NT) entries containing John 6:63:
John 8:37
John 12:50
John 17:8
Acts 5:20
1 Corinthians 15:22
Hebrews 4:12
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