Romans 15:12

And again, Isaiah saith, There shall be the root of Jesse, And he that ariseth to rule over the Gentiles; On him shall the Gentiles hope.

'Isaiah saith'. Isaiah 2:10

'That verse combines clearly the idea of Gentiles becoming servants to the Messiah who is of David's line. In the one verse we have David's successor and Gentile submission to him...it won't hurt to mention that Paul thought Isaiah 2:1 was being fulfilled in his day. The salvation of the Gentile in his day was found written in Isaiah 2:1. Since in Paul's day Isaiah 2:6 ff was not literally happening we conclude that Paul didn't understand it literally. Had Paul believed that the "that day" of Isaiah 2:10 was the day when wolves literally laid down with lambs, he wouldn't have applied it to his own day when wolves were not literally doing that...clearly Paul saw Isaiah 2:6 ff as. portrait of peace reminiscent of the garden of Eden.' (McGuiggan p. 420)

'This prophecy is from Isaiah 2:10. Those of premillennial persuasion apply this O.T. text to. future utopia on earth..Yet, Paul quotes. verse from that very text and applies it to men of different backgrounds and cultures, Jews and Gentiles; in the church right now!' (Green p. 13)

'the root of Jesse' -i.e. Jesus Christ (Revelation 5:5; Revelation 22:16) The royal house that sprang from Jesse (David's father) was cut down; from the root only. tender young sprout (Jesus) would grow up, so tiny and apparently so weak (considering His earthly background, advantages, and resources) compared with the old royal tree.

Point to Note:

Maybe many people are unpersuaded that Isaiah 2:6 ff is being fulfilled in the Church, when they fail to see truly changed lives! Maybe we are often the ones that cause the "problem in interpretation", by the selfish ways that we treat each other. Maybe if more of us actually applied Romans 15:1 ff, people might become more convinced of the proper interpretation of Isaiah 2:6 ff.