Passage
in the diligence not slothful; in the spirit fervent; the Lord serving;
in the diligence not slothful; in the spirit fervent; the Lord serving;
Romans 12:9 The love unfeigned: abhorring the evil; cleaving to the good;
Romans 12:10 in the love of brethren, to one another kindly affectioned: in the honour going before one another;
Romans 12:11 in the diligence not slothful; in the spirit fervent; the Lord serving;
Romans 12:12 in the hope rejoicing; in the tribulation enduring; in the prayer persevering;
Romans 12:13 to the necessities of the saints communicating; the hospitality pursuing.
The verse centers on "Spirit", "diligence", "slothful", "fervent", "lord", and "serving". It is saying that the verse draws attention to "Spirit" and "diligence", so its meaning should be read from those terms before moving to application.
The nearby context moves from verse 10's "in the love of brethren to one..." into verse 12's "in the hope rejoicing in the tribulation...", so "Spirit" and "diligence" belong inside that flow. In Romans context, the local focus is righteousness by faith, union with Christ, life in the Spirit, and God's covenant faithfulness.
A plain takeaway is to answer the verse's own emphasis on "Spirit" and "diligence" with trust shaped by these words, not by a vague optimism outside the passage.