They have all gone out of the way - They have "declined" from the true path of piety and virtue.

They are together - They have at the same time; or they have equally become unprofitable. They are as one; they are joined, or united in this declension. The expression denotes union, or similarity.

Become unprofitable - This word in Hebrew means to become "putrid" and "offensive," like fruit that is spoiled. In Arabic, it is applied to "milk" that becomes sour. Applied to moral subjects, it means to become corrupt and useless. They are of no value in regard to works of righteousness.

There is none ... - This is taken literally from the Hebrew.

They are all gone out of the way - παντες εξεκλιναν, they have all diverged from the right way, they have either abandoned or corrupted the worship of God: the Jews, in forsaking the law and the prophets, and the Gentiles, in acting contrary to the law which God had written on their hearts. And the departure of both from the truth proves the evil propensity of human nature in general.

They are together become unprofitable - ηχρειωθησαν. They are useless, good for nothing; or, as the Hebrew has it, נאלחו neelachu, they are putrid: he views the whole mass of mankind as slain and thrown together, to putrefy in heaps. This is what is termed the corruption of human nature; they are infected and infectious. What need of the mercy of God to save from such a state of degeneracy!

There is none that doeth good - In Romans 3:10 it is said, There is none righteous; here, There is none that doeth good: the first may refer to the want of a righteous principle; the second, to the necessary consequence of the absence of such a principle. If there be no righteousness within, there will be no acts of goodness without.

They are all gone out of the way,.... In Psalm 14:3; it is said, "they are all gone aside"; as persons in debt: man had a considerable stock of righteousness, holiness, knowledge, &c. but he has run through all, has contracted large and numerous debts, has been obliged to hide himself, has been used as a bankrupt, and turned out of house and home: Christ indeed has undertook to pay, and he has paid all the debts of his people; and has put them into a better state than ever Adam was in: in Psalm 53:3, it is rendered, "everyone of them is gone back"; that is, from God; from his commands, and from their former state and condition: here the phrase is rendered by the apostle, "they are all gone out of the way": that is, out of the way of God and his precepts, out of the way of holiness and righteousness, of light and life; into their own ways, the ways of sin, Satan, and the world of darkness, and of death: so Aben Ezra explains it, "out of the right way"; Kimchi and Ben Melech paraphrase it, "out of the good way: and so"

they are together become unprofitable; the word in Psalm 14:3 and Psalm 53:3; is translated, "they are become filthy"; which R. Aben Ezra interprets by "they are corrupt"; and R. Solomon Jarchi by , "they are turned to corruption"; the metaphor is taken from stinking flesh, which is tainted and corrupted, and so good for nothing, hence here rendered "unprofitable"; for so men being corrupted by sin, are of no use, service, and advantage to God, to men, or to themselves; but, on the contrary, nauseous to God, and to all that are good, and hurtful to themselves and others: for

there is none that does good, no, not one; and therefore must be unprofitable. There is none that can do good in a spiritual manner, without the grace of God, strength from Christ, and the assistance of the Spirit; and there is not even a spiritual man, that can do good perfectly, and without sin.

They are together become unprofitable (ἅμα ἠχρειώθησαν)

Only here in the New Testament: Together carries forward the all. The Hebrew of the Psalm means have become corrupt. The Greek word is to become useless. Compare John 15:6.

Good (χρησττότητα)

Only in Paul's writings. The radical idea of the word is profitableness. Compare have become unprofitable. Hence it passes readily into the meaning of wholesomeness. See on Matthew 11:30. It is opposed by Paul to ἀποτομία abruptness, severity (Romans 11:22). It is rendered kindness in Ephesians 2:7; Colossians 3:12; Galatians 5:22. Paul, and he only, also uses ἀγαθωσύνη for goodness. The distinction as drawn out by Jerome is that ἀγαθωσύνη represents a sterner virtue, showing itself in a zeal for truth which rebukes, corrects, and chastises, as Christ when He purged the temple. Χρηστότης is more gentle, gracious, and kindly Bishop Lightfoot defines it as a kindly disposition to one's neighbor, not necessarily taking a practical form, while ἀγαθωσύνη energizes the χρηστότης.

They are all gone out of the way, they are together become unprofitable; there is none that doeth good, no, not one.

3:12 None that doeth good. Not one absolutely good.

3:12 They have all turned aside - From the good way. They are become unprofitable - Helpless impotent, unable to profit either themselves or others.

3:9-18 Here again is shown that all mankind are under the guilt of sin, as a burden; and under the government and dominion of sin, as enslaved to it, to work wickedness. This is made plain by several passages of Scripture from the Old Testament, which describe the corrupt and depraved state of all men, till grace restrain or change them. Great as our advantages are, these texts describe multitudes who call themselves Christians. Their principles and conduct prove that there is no fear of God before their eyes. And where no fear of God is, no good is to be looked for.