The next 14 verses make a 14-point indictment.
Romans 3:10 —As it is written, There is none righteous, no, not one.
Quote from Psalm 14:1-3 — The fool hath said in his heart, There is no God. They are corrupt, they have done abominable works, there is none that doeth good. The LORD looked down from heaven upon the children of men, to see if there were any that did understand, and seek God. They are all gone aside, they are all together become filthy: there is none that doeth good, no, not one.
Romans 3:11 — There is none that understandeth, there is none that seeketh after God.
No man naturally seeks God.
Quote from Psalm 14:2 (see above).
Paul returns to this theme in Ephesians 4:18 — Having the understanding darkened, being alienated from the life of God through the ignorance that is in them, because of the blindness of their heart.
Romans 3:12 — They are all gone out of the way, they are together become unprofitable; there is none that doeth good, no, not one.
Man has strayed from the path.
unprofitable = useless, rotten, corrupted
None that doeth good — none that do anything of spiritual value
Quote from Psalm 14:3 (see above).
Romans 3:13 — Their throat is an open sepulchre; with their tongues they have used deceit; the poison of asps is under their lips.
Quote from Psalm 5:9 — For there is no faithfulness in their mouth; their inward part is very wickedness; their throat is an open sepulchre; they flatter with their tongue. And from Psalm 140:3 — They have sharpened their tongues like a serpent; adders' poison is under their lips. Selah.
The mouth is the chief way a sinner displays his sin, and the stench is like an open grave.
Deceit = making promises that are impossible to keep. The tense indicates a continuous action.
Romans 3:14 — Whose mouth is full of cursing and bitterness.
Full = heavy laden
Quote is from Psalm 10:7 — His mouth is full of cursing and deceit and fraud: under his tongue is mischief and vanity.
Romans 3:15-16 — Their feet are swift to shed blood. Destruction and misery are in their ways.
Quote is from Isaiah 59:7 — Their feet run to evil, and they make haste to shed innocent blood: their thoughts are thoughts of iniquity; wasting and destruction are in their paths.