The sermon works through Ephesians 2:11-22, returning first to the broader context before focusing on verses 19-22. Paul has been describing how Jews and Gentiles, once hostile strangers, are reconciled into one new humanity through Christ's death. The preacher opens with an illustration from a recent church sports day, where four people of different genders, ages, and nationalities played together on one court — a living picture of the diverse unity Paul describes. Before moving into verses 19-22, the sermon revisits verse 15, which says Christ "abolished the law with its commandments and regulations" by his death. This is unpacked through Romans 7:4-6, which explains that believers have died to the law through the body of Christ so they may belong to another, bear fruit for God, and serve in the new way of the Spirit rather than the old way of the letter. The law is holy, reflecting God's own character ("be holy, for I am holy"), but because humanity is sinful, the law only exposes guilt and condemns to death. The sermon illustrates this with C.S. Lewis's Narnia: Edmund is guilty under the deep magic law of the White Witch, and only when Aslan offers himself in Edmund's place is the law's demand satisfied. In the same way, Christ, who knew no sin, was made sin for humanity, so that those who believe in him are no longer condemned but justified before God — Jew and Gentile alike, uniting all backgrounds, including Indonesian, Chinese, Malaysian, and every nation, into one people in Christ.

Turning to verses 19-22, the sermon identifies two metaphors Paul uses to describe this new unity. The first is the church as family: no longer foreigners and aliens, but fellow citizens with God's people and members of God's household. Like any family, the church has conflict and imperfection, but genuine family members do not walk away over disagreements — the sermon compares this to children who fight fiercely and are laughing together minutes later. Paul roots this family identity in adoption (Ephesians 1:5) and treats "brothers and sisters" as more than a casual title; it carries real obligation, as seen in 1 Corinthians 8:11-13, where Paul refuses to eat meat for life rather than wound a weaker brother for whom Christ died — sinning against a brother is sinning against Christ himself. First Timothy 5:1-2 extends this further, instructing Timothy to treat older men as fathers, younger men as brothers, older women as mothers, and younger women as sisters, with purity. Ephesians 5:1-2 grounds it all in imitating God's own self-giving love. The sermon adds a striking claim from an unnamed writer: the church is the first family, and one's biological family is the second — meaning relationships in the church should model what family relationships are meant to be, especially since not all households are believing, and Jesus himself said he came to bring division within unbelieving families. The preacher notes that in some cultures, such as Sundanese culture, conversion can bring severe familial rejection, which makes the church's role as a true family even more vital.

The second metaphor, verses 20-22, shifts to the church as a building or temple, founded on the apostles and prophets with Christ Jesus as the cornerstone. Historically, the cornerstone was the first stone laid, the reference point for the entire structure — meaning Christ must be the center of everything the church does, just as Scripture itself is centered on him. The apostles and prophets form the foundation, representing the Old and New Testament witness. The sermon addresses Matthew 16:18, where Jesus tells Peter, "you are Petros, and on this petra I will build my church," noting the wordplay between Peter (a stone) and the rock (petra) — often taken by Protestants to refer to Peter's confession rather than Peter himself, in contrast to Catholic tradition's emphasis on Peter (illustrated by St. Peter's Basilica). Citing Reformed theologian Edmund Clowney, the sermon argues these need not be opposed: Christ alone is the cornerstone and center, but Peter, as an apostle and New Testament author, is genuinely part of the foundation alongside the other apostles and prophets — meaning the church builds not on human opinion or experience but on the taught word of God, which is why the sermon commends expository, apostolic preaching as foundational.

Believers, like living stones from every nation, language, and background, are built together into this holy temple — echoing 1 Corinthians 6:19, where each believer's individual body is already a temple of the Holy Spirit. But Paul in Ephesians 2 points to something more: a corporate, special presence of God when his people gather together. The sermon illustrates this with a story of a nervous seven-year-old on a diving board who can only jump once his father moves close enough below to be seen — the presence of God, not merely the church building, is what gives courage and comfort. Psalm 133 ("how good and pleasant when brothers dwell in unity") and Solomon's prayer at the temple dedication (1 Kings 8:27 — even the highest heavens cannot contain God, let alone a house built by human hands) reinforce that God's presence was never about a building, even one as magnificent as St. Peter's Basilica, but about his people gathered in his name, as Jesus promises in Matthew 18:20. The sermon closes with a testimony from a longtime member, Pak Nemuel, who once feared the church (then MRI Melbourne) would collapse amid conflict in 1998-2003, yet later found it had grown rather than died — evidence of God's sustaining presence. The congregation is urged to prepare their hearts for worship, to treasure gathered worship (citing Good Friday as an example of especially prepared hearts), and to live as a family and a holy temple, strengthened to go out and do good works that glorify the Father.

Bible Verses Used

• Ephesians 2:11-22: The main passage; describes Jew and Gentile reconciled into one new humanity, one family, and one holy temple in Christ.

• Romans 7:4-6: Explains how believers died to the law through Christ's body so they might serve in the new way of the Spirit.

• Matthew 16:18: Discussed for the Petros/petra wordplay regarding the church's foundation on Christ and the apostles.

• 1 Corinthians 8:11-13: Illustrates a believer's responsibility to a weaker brother for whom Christ died.

• 1 Timothy 5:1-2: Shows Paul instructing Timothy to treat church members with familial affection and respect.

• Ephesians 1:5: Grounds the church's family identity in believers' adoption as God's children.

• Ephesians 5:1-2: Calls believers to imitate God's self-giving love as beloved children.

• 1 Corinthians 6:19: Establishes that each believer's body individually is a temple of the Holy Spirit.

• Psalm 133: Celebrates the goodness of God's people dwelling together in unity.

• 1 Kings 8:27: Solomon's confession that no building, however grand, can contain God, anticipating the truth that God's presence is found in his gathered people, not in a structure.

• Matthew 18:20: Cited for Jesus's promise to be present where two or three gather in his name.