Romans 3:14

“Whose mouth is full of cursing and bitterness.” Of the venom of asps indeed he did not say that their lips were full. For in that vice perhaps many may be found, yet not many who put forth that venom's poison fully and in its entirety. But to have the mouth filled with cursing and bitterness belongs to very many. For who is of so corrected a mouth that the habit of cursing does not tempt him — I will not say against those who are worthy of cursing, but against those whom the Lord has not cursed, that is, just and innocent men? This is a ready and downhill vice of human frailty, especially toward subordinates and inferiors: so that they no longer think this manner of address to be cursing. And therefore their mouth is said to be full, and cursing is said to flow unceasingly as from a full vessel of the mouth. Yet with this bitterness too is joined, because it is drawn out from the gall of wrath. For it is through wrath and fury that the tongue is driven to cursing. And therefore the same Apostle says: “Bless, and do not curse”; and elsewhere: “Lest any root of bitterness springing up hinder you.”

"What then have we more than they? For we have proved both Jews and Gentiles, that they are all under sin. As it is written, There is none righteous, no, not one." He had accused the Gentiles, he had accused the Jews; it came next in order to mention the righteousness which is by faith. For if the law of nature availed not, and the written Law was of no advantage, but both weighed down those that used them not aright, and made it plain that they were worthy of greater punishment, then after this the salvation which is by grace was necessary. Speak then of it, O Paul, and display it. But as yet he does not venture, as having an eye to the violence of the Jews, and so turns afresh to his accusation of them; and first he brings in as accuser, David speaking of the same things at length, which Isaiah mentioned all in short compass, so furnishing a strong curb for them, so that they might not bound off, nor any of his hearers, while the matters of faith were laid open to them, might after this start away; being beforehand safely held down by the accusations of the prophets. For there are three excesses which the prophet lays down; he says that all of them together did evil, and that they did not do good indifferently with evil, but that they followed after wickedness alone, and followed it also with all earnestness. And next that they should not say, "What then, if these things were said to others?" he goes on:

"God stood in the congregation of the gods, He judges among the gods." He [here] refers to the Father and the Son, and those who have received the adoption; but these are the Church. For she is the synagogue of God, which God-that is, the Son Himself-has gathered by Himself. Of whom He again speaks: "The God of gods, the Lord hath spoken, and hath called the earth." Who is meant by God?

It is clear and obvious that evil people are always throwing curses and bitterness at the good in an attempt to harm and distract them.

Fourth, he designates the abundance of these sins when he says: whose mouth is full of cursing and bitterness, because they have a plentiful supply of curses, for they curse in slandering others, contrary to what he says below: bless them and curse not (Rom …