Passage
“Whose mouth is full of cursing and bitterness”;
“Whose mouth is full of cursing and bitterness”;
Romans 3:12 All have turned aside, together they have become worthless; There is none who does good, There is not even one.”
Romans 3:13 “Their throat is an open tomb, With their tongues they keep deceiving,” “The poison of asps is under their lips”;
Romans 3:14 “Whose mouth is full of cursing and bitterness”;
Romans 3:15 “Their feet are swift to shed blood,
Romans 3:16 Destruction and misery are in their paths,
The verse centers on "whose", "mouth", "full", "cursing", and "bitterness". It is saying that the verse draws attention to "whose" and "mouth", so its meaning should be read from those terms before moving to application.
The nearby context moves from verse 13's "Their throat is an open tomb With..." into verse 15's "Their feet are swift to shed blood...", so "whose" and "mouth" 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 "whose" and "mouth" with trust shaped by these words, not by a vague optimism outside the passage.