Understanding Romans 1:3-4

Is Mark 1:1 speaking of Matt 1:25 or Mark 1:14/15 as the beginning? Consider The gospel of Jesus as being the word God sent, the gospel, of Acts 10:36-40 compared to Mark 1:14 and what Paul said in 1 Cor 15:1-4.

I believe the gospel is relative to the kingdom of God and being born into it, with Jesus being the firstborn out of the dead, having, preeminence, thereof. Rom 1:4

 

One ought to quote the entire sentence.

*Romans 1:1-7*
Paul, a servant of Christ Jesus, called to be an apostle, set apart for the gospel of God, which he promised beforehand through his prophets in the holy Scriptures, concerning his Son, who was descended from David according to the flesh and was declared to be the Son of God in power according to the Spirit of holiness by his resurrection from the dead, Jesus Christ our Lord, through whom we have received grace and apostleship to bring about the obedience of faith for the sake of his name among all the nations, including you who are called to belong to Jesus Christ, To all those in Rome who are loved by God and called to be saints: Grace to you and peace from God our Father and the Lord Jesus Christ.

*Romans 1:1-7*
This letter is from Paul, a slave of Christ Jesus, chosen by God to be an apostle and sent out to preach his Good News. God promised this Good News long ago through his prophets in the holy Scriptures. The Good News is about his Son. In his earthly life he was born into King David’s family line, and he was shown to be the Son of God when he was raised from the dead by the power of the Holy Spirit. He is Jesus Christ our Lord. Through Christ, God has given us the privilege and authority as apostles to tell Gentiles everywhere what God has done for them, so that they will believe and obey him, bringing glory to his name. And you are included among those Gentiles who have been called to belong to Jesus Christ. I am writing to all of you in Rome who are loved by God and are called to be his own holy people. May God our Father and the Lord Jesus Christ give you grace and peace.

 

1:4 the-(one) having-been-appointed/declared Son of-God in power

a. aorist pass. participle of ὁρίζω (LN 37.96) (BAGD 1.b. p. 581):

‘to be appointed’ [BECNT, HNTC, ICC2, NTC, WBC; NCV, NET],
‘to be designated’ [LN, NICNT],
‘to be established as’ [AB],
‘to be declared’ [BAGD; GW, KJV, NASB, NIV],
‘to be declared to be’ [NRSV],
‘to be proclaimed’ [REB],
‘to be proved’ [CEV],
‘to be shown to be’ [NLT, TEV].​

b. ἐν with dative object (LN 13.8, 89.80) (BAGD III.2. p. 261): ‘in’ [HNTC, ICC2, LN (13.8), NICNT, WBC; GW, NET], ‘with’ [AB, BAGD, LN (13.8, 89.80); KJV, NASB, NCV, NIV, NRSV, TEV], ‘invested with’ [NTC], ‘by’ [REB], not explicit [CEV].

David Abernathy, An Exegetical Summary of Romans 1–8, 2nd ed. (Dallas, TX: SIL International, 2008), 17.

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ὁρίζω; 1 aor. ὥρισα; Pass., pf. ptcp. ὡρισμένος; 1 aor. ptcp. ὁρισθείς; (fr. ὅρος a boundary, limit); fr. [Aeschyl. and] Hdt. down; to define; i.e.
1. to mark out the boundaries or limits (of any place or thing): Hdt., Xen., Thuc, al.; Num. 34:6; Josh. 13:27.

2. to determine, appoint: with an acc. of the thing, ἡμέραν, Heb. 4:7; καιρούς, Acts 17:26, (numerous exx. fr. Grk. auth. are given in Bleek, Hebr.-Br. ii. 1 p. 538 sq.); pass. ὡρισμένος, ‘determinate,’ settled, Acts 2:23; τὸ ὡρισμ. that which hath been determined, acc. to appointment, decree, Lk. 22:22;
with an acc. of pers. Acts 17:31 (ᾧ by attraction for ὅν [W. § 24, 1; B. § 143, 8]); pass. with a pred. nom. Ro. 1:4 (for although Christ was the Son of God before his resurrection, yet he was openly appointed [A. V. declared] such among men by this transcendent and crowning event); ὁρίζω, to ordain, determine appoint, Acts 10:42; foll. by an inf. Acts 11:29 (Soph. fr. 19 d. [i.e. Aegeus (539), viii. p. 8 ed. Brunck]). [Comp.: ἀφ-, ἀπο-δι-, προ-ορίζω.]*

Joseph Henry Thayer, A Greek-English Lexicon of the New Testament: Being Grimm’s Wilke's Clavis Novi Testamenti (New York: Harper & Brothers., 1889), 453.​

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(2) BDB [Brown, Driver, Briggs] Lexicon
ὁρίζω (ὅρος) fut. 3 sg. ὁριεῖ LXX; 1 aor. ὥρισα, pf. 3 pl. ὁρίκασιν (Tat. 17, 3). Pass.: 1 aor. 3 sg. ὡρίσθη (Just., A I, 44, 12); ptc. ὁρισθείς; pf. ptc. ὡρισμένος (Aeschyl., Hdt.+)

① from the basic mng., ‘to separate entities and so establish a boundary’, derives the sense ‘to define ideas or concepts’: set limits to, define, explain (X. et al. [as Ath. 6, 1] in act. and mid.) περί τινος give an explanation concerning someth. 12:1. τὸ ὕδωρ καὶ τὸν σταυρὸν ἐπὶ τὸ αὐτὸ ὥρισεν he defined the water and the cross together (i.e. in the section on the tree by the streams of water Ps 1:3) 11:8. Sim.

② to make a determination about an entity, determine, appoint, fix, set

ⓐ of things
α. expressed by the acc. προφήτης ὁρίζων τράπεζαν a prophet who orders a meal (s. τράπεζα 2) D 11:9 (w. double acc.: Πυθαγόρας … ἔσχατον ὁρίζει φύσιν Theoph. Ant. 3, 7 [p. 216, 12]).—Of time (Pla., Leg. 9 p. 864e; Demosth. 36, 26 ὁ νόμος τὸν χρόνον ὥρισεν; Epict., Ench. 51, 1; PFlor 61, 45 [85 a.d.]; Jos., C. Ap. 1, 230; Just., D. 102, 4 χρόνους; more freq. pass., s. below) ἡμέραν Hb 4:7. ὁρ. προστεταγμένους καιρούς set appointed times Ac 17:26.—μηδὲν ὁρίζοντες μηδὲ νομοθετοῦντες without making rules or ordinances GMary 463, 29.—Pass. (SIG 495, 171; PFay 11, 16 [c. 115 b.c.]; PAmh 50, 15; PTebt 327, 12 al.) ὡρισμένοι καιροί (Diod S 1, 41, 7; cp. 16, 29, 2; Jos., Ant. 6, 78) appointed times 1 Cl 40:2. ὡρισμένης τῆς ἡμέρας ταύτης after this day has been fixed Hv 2, 2, 5 (Diod S 2, 59, 5; 20, 110, 1 ὡρισμένη ἡμέρα; Herodian 1, 10, 5 ὡρισμένης ἡμέρας; Pollux 1, 67).—ὁ ὡρισμένος τόπος the appointed place 19:1 (cp. Iren. 5, 31, 2 [Harv. II 412, 1]). οἱ ὡρισμένοι νόμοι the established laws Dg 5:10. ὁ ὡρισμένος τῆς λειτουργίας κανών the established limits of (one’s) ministry 1 Cl 41:1. ἡ ὡρισμένη βουλή the definite plan Ac 2:23.—Subst. (cp. SIG 905, 14 τῶν ὁρισθέντων ἄγνοια) κατὰ τὸ ὡρισμένον in accordance with the (divine) decree Lk 22:22.
β. by an inf. (Appian, Bell. Civ. 5, 3 §12 ἀντιδοῦναι=to give as recompense; ApcMos 28 φυλάττειν; B-D-F §392, 1a) ὥρισαν … πέμψαι they determined (perh. set apart; so Field, Notes 119f and TGillieson, ET 56, ’44/45, 110) … to send Ac 11:29; by an indirect quest. 1 Cl 40:3.
ⓑ of persons appoint, designate, declare:
God judges the world ἐν ἀνδρὶ ᾧ ὥρισεν through a man whom he has appointed Ac 17:31. Pass. ὁ ὡρισμένος ὑπὸ τοῦ θεοῦ κριτής the one appointed by God as judge 10:42. Of eccl. superintendents or overseers οἱ κατὰ τὰ πέρατα ὁρισθέντες those who are appointed in distant lands IEph 3:2. W. double acc. declare someone to be someth. (Meleag. in Anth. Pal. 12, 158, 7 σὲ γὰρ θεὸν ὥρισε δαίμων) pass. τοῦ ὁρισθέντος υἱοῦ θεοῦ ἐν δυνάμει who has been declared to be the powerful son of God Ro 1:4.—DELG s.v. ὅρος. M-M. TW.

William Arndt et al., A Greek-English Lexicon of the New Testament and Other Early Christian Literature (Chicago: University of Chicago Press, 2000), 723.
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Wrong.
Acts of the Apostles 13:33, ". . . God hath fulfilled the same unto us their children, in that he hath raised up Jesus again; as it is also written in the second psalm, Thou art my Son, this day have I begotten thee. . . ."