Greek Key Terms:
Context: Acts 2:16-17 records Peter's Pentecost sermon: "But this is what was uttered through the prophet Joel: 'And in the last days it shall be, God declares, that I will pour out my Spirit on all flesh.'" The context is dramatic: disciples filled with Holy Spirit, speaking in tongues (vv. 1-4); crowd confused (vv. 5-13); Peter explains (vv. 14-36). His declaration "this is that" (touto... esti to eirēmenon) marks the HERMENEUTICAL PIVOT: Joel's "afterward" prophecy (Joel 2:28-32) is being fulfilled NOW at Pentecost. Peter interprets Joel's "afterward" as "in the last days"—the eschatological age has arrived, not merely future. This reinterprets all OT "latter days" prophecies: inaugurated at Christ's first coming, to be consummated at His return. The "already/not yet" tension begins here.
Connections:
Christological Connection: Acts 2:16-17's declaration—"But this is what was uttered through the prophet Joel: 'And in the last days it shall be, God declares, that I will pour out my Spirit on all flesh'"—marks the HERMENEUTICAL EARTHQUAKE of NT eschatology. Peter's "this is that" (touto estin to eirēmenon) reinterprets the entire "latter days" timeline: what OT prophets described as distant future has arrived NOW at Pentecost. Joel 2:28 prophesied "afterward" ('aḥărê-kēn) Spirit-outpouring; Peter interprets this "afterward" as "in the last days" (en tais eschatais hēmerais)—the terminal era of redemptive history. This transforms understanding: Genesis 49:1 anticipated "last days"; Numbers 24:14 prophesied "latter days" events; Deuteronomy 4:30 promised "latter days" restoration; Isaiah 2:2 envisioned "latter days" kingdom; Daniel 2:28 revealed "latter days" mysteries—ALL these prophecies find their interpretive key at Pentecost. The "last days" are not merely future but INAUGURATED at Christ's death, resurrection, ascension, and Spirit-sending. This creates "already/not yet" tension: the eschaton has begun (already) but awaits consummation (not yet). Hebrews 1:2 confirms: "in these last days he has spoken to us by his Son"—emphatic present reality. First Peter 1:20 states Christ "was manifested in the last times"—incarnation = eschatological moment. The church age exists within the "last days"—between inauguration (Pentecost) and consummation (Parousia). This dual character appears throughout NT: blessing (Spirit poured out, Acts 2:17) coexists with trial (apostasy, 2 Timothy 3:1; scoffers, 2 Peter 3:3; Jude 18). James 5:3 addresses wealthy in present tense: "You have laid up treasure in the last days"—not future but now. The Spirit-outpouring Peter witnessed fulfills Joel's eschatological prophecy: "all flesh" (universal—Jew and Gentile); "sons and daughters" (egalitarian—gender equality); "servants" (democratic—social equality); "prophesy... dreams... visions" (revelatory—all believers access God). Pentecost reverses Babel: Acts 2:5-11 records "devout men from every nation under heaven" each hearing gospel "in his own native language"—scattered nations reunited through Spirit. The trajectory shows: OT prophets anticipate "latter days" as distant future (Genesis 49:1; Deuteronomy 4:30; Isaiah 2:2; Daniel 2:28; Joel 2:28) → Christ accomplishes redemption (death/resurrection) → ascended Christ sends Spirit (Acts 2:1-4) → Peter declares "this is that"—the "last days" have arrived (Acts 2:16-17) → NT writers consistently refer to their era as "last days" (Hebrews 1:2; 1 Peter 1:20; 2 Timothy 3:1; James 5:3; 1 John 2:18) → church age continues in "already/not yet" tension → Christ returns to consummate kingdom (Revelation 21-22). Peter's Pentecost sermon reinterprets all previous "latter days" prophecy: the age to come has broken into the present age; the eschatological Spirit has been poured out; the final era before Christ's return has begun. Believers live in the "last days" NOW—experiencing firstfruits of kingdom (Romans 8:23) while awaiting final harvest (Revelation 14:15).
Connection Method(s): Promise-Fulfillment, Redemptive-Historical Progression — Peter's "this is that" declaration at Pentecost marks the hermeneutical pivot: Joel's eschatological prophecy is fulfilled NOW, reinterpreting all OT "latter days" prophecies as inaugurated at Christ's coming.
Trajectory Table: 093 - Last Days Eschatology