The sermon continues a series in Genesis, picking up in chapter 18 with the account of the LORD's visit to Abraham and his subsequent conversation with him about Sodom and Gomorrah (18:16-33). The preacher opens by noting a news story about paid-companion services in Indonesia, observing that people increasingly rent friendship because genuine friendship is costly and slow to build — a contrast he uses to introduce the sermon's theme, drawn from a hymn line sung earlier in the service ("as friend with friend"): what it means that Abraham, uniquely in the Old Testament, is called God's friend (2 Chronicles 20:7), and that believers in Christ are given the same status (John 15:15).

The sermon frames this in light of Abraham's recent failure in Genesis 16, where his impatience led him to take Hagar rather than trust God's promise. Despite that failure, God appears to Abraham again in chapter 18 — eating at his tent and speaking with him as a friend — which the preacher holds up as pure grace: God restores intimacy with Abraham not because Abraham earned it but because God chooses to. The three visitors are identified as a theophany or Christophany, and Abraham's lavish, hurried hospitality toward them is contrasted with Lot's more reluctant welcome of the same messengers in Sodom, foreshadowing the divergent outcomes of the two men's households.

The first major point centers on God's reaffirmed promise that Sarah will bear a son within the year. This specificity turns what was a general promise into a pointed test of faith — the more precise the promise, the higher the risk of disappointment, which explains Sarah's inward laughter and denial. The preacher connects God's gentle-but-firm rebuke of Sarah's unbelief to Jesus' rebuke of Peter sinking on the water ("O you of little faith, why did you doubt?") and to Thomas being invited to touch Christ's wounds: in each case, grace precedes and enables the correction — Peter is rescued before being rebuked, Thomas is shown mercy before being urged to believe. This becomes the sermon's central theological move: God knows the depth of human sin and doubt far more thoroughly than we or others do, yet his grace exceeds that sin. The point is illustrated by contrasting King Saul, who hardened his heart and fled from God after being confronted with his disobedience, with King David, who — though guilty of adultery, murder, and cover-up with Bathsheba and Uriah — broke and repented immediately when confronted by Nathan, praying for a pure heart rather than fleeing God's presence. The preacher warns against a Saul-like image of God as one who abandons the doubting or disobedient, insisting instead that saving faith need not be great, only genuine — "faith the size of a mustard seed" resting on a great and faithful God.

The second point turns to the responsibility that accompanies this friendship with God: God's choice of Abraham is not because of Abraham's righteousness but so that Abraham would "command his children and his household after him" to keep the way of the LORD, doing righteousness and justice (18:19). The preacher stresses that election grounds obedience rather than excusing it, and applies this pointedly to the duty of fathers to disciple their children — citing a study claiming that when a father becomes the first believer in a family, the great majority of the household eventually follows, compared to a much smaller proportion when only the mother believes. He shares his own testimony of learning gambling from his father as a child and urges parents, especially fathers, not to delegate spiritual formation to Sunday school, illustrating persistent, tearful parental prayer with the story of Monica weeping for her wayward son Augustine until, through Ambrose's encouragement that God could not fail to hear such prayers, Augustine was converted and became one of the church's greatest theologians. This is set against a preview of Lot's family in the following chapters — a wife who looks back and dies, sons-in-law who mock the warning as a joke, and daughters who corrupt their father — as the fruit of a father who did not lead his household in the fear of God.

Finally, the sermon treats Abraham's intercession for Sodom (18:23-32) as an expression of being a "friend of sinners" in a positive sense — unlike Lot, who became like the sinners of Sodom, Abraham loves sinners by pleading for their sparing, appealing to God's own righteous and just character rather than sentiment, echoing the wheat-and-tares principle that judgment which uproots the wicked need not also destroy the righteous. His bargaining stops at ten, a number the preacher links to the later rabbinic minyan (minimum quorum for a synagogue), reflecting the principle that as long as a righteous minority remains, mercy toward the wicked still holds hope of reformation, but once none remain, mercy only entrenches wickedness. Genesis 19:29 shows the prayer was not wasted: God remembers Abraham and rescues Lot from the overthrow. The sermon closes by returning to the theme of costly, grace-grounded obedience: believers, having been made friends of God purely by grace through Christ's blood, are called to extend the same friendship to sinners around them — praying for, loving, and witnessing to those who do not yet know God, including in the church's outreach to students near Monash University.

Bible Verses Used

• Genesis 18:16-33: The sermon's primary text — the LORD's visit to Abraham, the reaffirmed promise of a son, and Abraham's intercession for Sodom.

• 2 Chronicles 20:7: Cited to show Abraham is uniquely called "God's friend" in the Old Testament.

• John 15:15: Cited to show believers in Christ are likewise called friends, not servants.

• Matthew 14:28-31 (Peter walking on water): Used to parallel God's rebuke of Sarah's doubt with Jesus rescuing Peter before rebuking his little faith.

• John 20:24-29 (Thomas): Used to show grace extended to Thomas's doubt before his belief is affirmed.

• Matthew 17:20 (mustard seed faith): Cited to argue that saving faith need only be small, resting on a great God.

• Psalm 51 (create in me a pure heart): Referenced as David's repentant response after Nathan's confrontation, contrasted with Saul's hardened response.

• Genesis 19:29: Cited to show God "remembered Abraham" and rescued Lot, confirming Abraham's intercession was not in vain.