Signs, for John, answer the question, “Who is Jesus?” At the wedding feast in Cana, John reveals (amongst other things) that Jesus ushers in the messianic age in which wine (evidence of blessed fruitfulness and provision) will flow in overwhelming abundance and the mountains will drip with the best wine for the joy of God’s people (cf. Joel 3:18, Amos 9:13-14, and Her, 31:12

The invitation that Jesus provides to all of his disciples is a relationship–to be with him, to become like him, to do what he did–to find flourishing by joyfully and increasingly submitting every area of our lives to his empowering presence and Lordship!

"In Jesus, old covenant types (i.e. Adam, the Passover Lamb, the Tabernacle, etc.) give way to the new creation antitype—shadow is supplanted by substance. To “Behold, the Lamb of God” is to see in Jesus the arrival of the suffering servant of Isaiah’s prophecy (Isa. 53:4–12), who took the punishment we deserve to give us the grace we could never earn." — ESV Gospel Transformation Bible

Grace is the pipeline—the inexhaustible well—through which we receive all that God wants to give us (i.e. the greatness of Christ, the greatness of his love, the greatness of the gospel). But this isn’t just a concept to be understood, it’s a reality to be lived into.

There is no parallel anywhere else in the world’s religions to the sympathetic presence of God in Christ sharing our human struggle with us. Our God was not immune to human suffering. Therefore, ‘Christmas can only be understood as a wonder’ — Karl Barth.

No one had ever seen God in a full/complete way until Jesus revealed him (1:18) — The world still cannot see God except through Jesus’ through his witnesses (i.e. his Church/disciples) modeling their lives after the character of Jesus (John 13:35, 17:21-23; 1 John 4:12).

Jesus is eternally one with the Father—the very Word of God (John 1:1–2), God’s agent in creating all things (vv. 3–4). And as he spoke light and brought life into the dark void of pre-creation chaos, so Jesus brings light and life into the dark world of sin and death.

What we see in Jesus, the creator of all things, is both the joy of creating itself and the love of sharing it with others. Our understanding of and belief in Jesus as the Creator is an indispensable attribute to our ability to mirror his creativity as image bearers.

In vv. 1-2, John is saying the gospel reveals that the meaning of life isn’t an abstract idea or to “find what makes you happy and do it” (like the Greeks believed), but to be in a relationship with the creator of the universe — an idea as mind-boggling as it is wonderful!