Why did Paul go to preach to the Gentiles?
It was already planned by God where his word would be preached. Saint Paul didn't have any choice but to go where God the Father forced his body to go.
Galations 3
8: And the scripture, foreseeing that
God would justify the Gentiles by faith,
preached the gospel beforehand to Abraham, saying, "In you shall all the nations be blessed."
All God's created men made both male and female will be blessed with the gospel, also known as the Word of God.
Titus 2:11
11: For
the grace of God has appeared for the salvation of all men,
I Timothy 4:10
10: For to this end we toil and strive, because we have our hope set on
the living God, who is the Savior of all men, especially of those who believe.
Isaiah 25
6: On this mountain the LORD of hosts will make for all peoples a feast of fat things, a feast of wine on the lees, of fat things full of marrow, of wine on the lees well refined.
7: And he will destroy on this mountain the covering that is cast over all peoples, the veil that is spread over all nations.
8: He will swallow up death for ever, and
the Lord GOD will wipe away tears from all faces, and the reproach of his people he will take away from all the earth; for the LORD has spoken.
9: It will be said on that day, "Lo, this is our God; we have waited for him, that he might save us. This is the LORD; we have waited for him; let us be glad and rejoice in his salvation."
Romans 14: 9-12
9: For to this end Christ died and lived again, that he might be Lord both of the dead and of the living.
10: Why do you pass judgment on your brother? Or you, why do you despise your brother? For we shall all stand before the judgment seat of God;
11: for it is written, "
As I live, says the Lord, every knee shall bow to me, and every tongue shall give praise to God."
12: So each of us shall give account of himself to God.
Psalms 22
27:
All the ends of the earth shall remember and turn to the LORD; and all the families of the nations shall worship before him.
Habakkuk 3:
12: Thou didst bestride the earth in fury, thou didst trample the nations in anger.
13:
Thou went forth for the salvation of thy people, for the salvation of thy anointed. Thou didst crush the head of the wicked, laying him bare from thigh to neck. Selah