As such, Romans 14 could be recapitulated: Let us walk properly as in the daytime, not quarrelling over opinions which hold little eternal significance, since the age to come is not a matter of eating and drinking but of righteousness and peace and joy in the Holy Spirit.
Far from redefining the common Jewish eschatology, Paul is simply describing its future reality, hence reinforcing the sobriety and eternal perspective inherent in Jewish apocalypticism. This futurist approach squares with both the passage as a whole and with common expectations of the kingdom. Interposing realized eschatology into Romans 14 is both illogical and counterproductive to Paul’s argument that eschatology (cf. “salvation,” “the day,” “judgment seat,” “kingdom”) is the primary driver of Christian discipleship. - John P. Harrigan, the Gospel of Christ Crucified, p.281-282