Why believe in Jesus
The double force of the verb is maintained. When Jesus is ‘lifted up’ on the cross, he is being ‘lifted up’ to his Father’s presence, returned to the glory he enjoyed with the Father before the world began (17:5). This does not mean that the cross is merely the first stage on the way to the real exaltation, however, since the cross itself is the glorification of Jesus (cf. notes on 1:14; 12:23–33). The exaltation of Jesus by means of the cross is also the exaltation of Jesus on the cross.
These verses are present in most of the medieval Greek miniscule manuscripts, but they are absent from virtually all early Greek manuscripts that have come down to us, representing great diversity of textual traditions. The most notable exception is the Western uncial D, known for its independence in numerous other places. They are also missing from the earliest forms of the Syriac and Coptic Gospels, and from many Old Latin, Old Georgian and Armenian manuscripts. All the early church Fathers omit this narrative: in commenting on John, they pass immediately from 7:52 to 8:12. No Eastern Father cites the passage before the tenth century.
On the other hand, there is little reason for doubting that the event here described occurred, even if in its written form it did not in the beginning belong to the canonical books.
the lighting of the four huge lamps in the temple’s court of women and of the exuberant celebration that took place under their light (Mishnah Sukkah 5:1–4). ‘Men of piety and good works’ danced through the night, holding burning torches in their hands and singing songs and praises. The Levitical orchestras cut loose, and some sources attest that this went on every night of the Feast of Tabernacles, with the light from the temple area shedding its glow all over Jerusalem. In this context Jesus declares to the people, I am the light of the world.
1 - Jesus is the Light
This is the second of the ‘I am’ statements that are followed by a predicate (cf. notes on 6:35). Of the incarnate Word we have already learned that the life ‘was the light of men’ (cf. notes on 1:4). The light metaphor is steeped in Old Testament allusions. The glory of the very presence of God in the cloud led the people to the promised land (Ex. 13:21–22) and protected them from those who would destroy them (Ex. 14:19–25). The Israelites were trained to sing, ‘The LORD is my light and my salvation’ (Ps. 27:1). The word of God, the law of God, is a light to guide the path of those who cherish instruction (Ps. 119:105; Pr. 6:23); God’s light is shed abroad in revelation (Ezk. 1:4, 13, 26–28) and salvation (Hab. 3:3–4). ‘Light is Yahweh in action, Ps. 44:3’ (H. Conzelmann, TDNT 9, 320). Isaiah tells us that the servant of the LORD was appointed as a light to the Gentiles, that he might bring God’s salvation to the ends of the earth (Is. 49:6). The coming eschatological age would be a time when the LORD himself would be the light for his people (Is. 60:19–22; cf. Rev. 21:23–24). Perhaps Zechariah 14:5b–7 is especially significant, with its promise of continual light on the last day, followed by the promise of living waters flowing from Jerusalem—this passage probably forming part of the liturgical readings of this Feast (cf. notes on 7:37–39). The great, burning lights of the Feast of Tabernacles resonate with such strains. Already in the Fourth Gospel the dawning of the light in the coming of Jesus has been a significant theme. In this age of an inaugurated but not yet consummated kingdom, however, the light is still in mortal combat with darkness (1:4, 9; 3:19–21).