A good man This is the commonly received interpretation of the passage. I am disposed, however, to prefer another, That it shall be well with those who are gracious and communicative; because this is more in accordance with the purport of the prophet's language. It is his intention to show how greatly the ungodly are deceived, when they aspire after happiness by nefarious and unlawful practices; seeing that the favor of God is the source and cause of all good things. Hence it becomes necessary to supply the relative who. He proceeds, therefore, to put us on our guard as to the deception which those practice upon themselves, who hasten to enrich themselves by sordid parsimony and oppressive extortion; inasmuch as the faithful, by their clemency and kindness, open up a channel, through which the favor of God flows to them: for the term tvv, tob, though in the masculine gender, signifying good, is often taken as if it were neuter, to denote that which is good. He puts lending as if it were the fruit of mercy; for the usurer also lends, but it is that, under the false pretense of assisting the distressed, he may plunder them. It is, then, the truly liberal, who, from compassion, and not with the design of ensnaring the poor, grant relief to them, that God makes prosperous. The term dvym, debarim, in the end of the verse, signifies words; but, along with David Kimchi, the most correct expositor among the Rabbins, I take it to mean affairs. Words is a very tame translation, [1] not to say, that, if this had been the prophet's intention, he would have expressed himself in more simple terms. The translation which I have given is the proper one, that the righteous will manage their affairs with prudence and discernment; so that, in their domestic affairs, they will neither be too lavish nor sordidly parsimonious; but, in every thing, they will study to combine frugality with economy, without giving way to luxury. And, in all their mercantile transactions; they will always be guided by the principles of equity and morality.

Footnotes

1 - It is so translated in some of the ancient versions, and by several critics. In the Syriac it is, "will support his words in judgment;" i.e., will never utter any thing but what is strictly true. In like manner, Cocceius. In the Arabic, which is followed by Castalio, it is, "will moderate his words in judgment;" i.e., will speak as favourably of delinquents as he can consistently with truth, contrary to the practice of the wicked. -- Psalm 94:21.

A good man showeth favor - He has the means to show favor to others, or to promote their welfare, and he is disposed to do this. It is the characteristic of a good man - of a heart that is truly pious - to do good to others; to promote their welfare here, and to assist them in their endeavor to secure happiness in the world to come.
And lendeth - The original word here - לוה lâvâh - means to join oneself to anyone; to cleave to him; then, to form the union which is constituted between debtor and creditor, borrower and lender. Here it is used in the latter sense, and it means that a good man will accommodate another - a neighbor - with money, or with articles to be used temporarily and returned again. A man who always "borrows" is not a desirable neighbor; but a man who never lends - who is never willing to accommodate - is a neighbor that no one would wish to live near - a crooked, perverse, bad man. True religion will always dispose a man to do acts of kindness in any and every way possible.
He will guide his affairs - The word used here means literally to hold, contain; to hold up, or sustain; to nourish, to furnish the means of living. Genesis 45:11; Genesis 47:12; Genesis 50:21. Here it means that he would uphold or manage his business.
With discretion - Margin, "judgment;" so the Hebrew. He would do it prudently, sensibly, economically, wisely. This is, or should be, one of the characteristics of a good man. Religion prompts to this; religion will aid a man in doing this; religion will tend to check everything of a contrary nature. A man who neglects his "affairs," who pays no attention to his business, who is indifferent whether he is successful or fails, is a man who gives "just so evidence" that he is a stranger to true religion.

A good man sheweth favour, and (d) lendeth: he will guide his affairs with discretion.
(d) He shows what the fruit of mercy is, to lend freely and not for gain, and so to measure his doings that he may be able to help where need requires and not to bestow all on himself.

A good man showeth favour, and lendeth,.... Without usury, hoping for nothing again: he pities those that labour under difficulties, for want of a little money; and he generously lends it till they are able to pay him again; which oftentimes is of as much service as if it was given; see Psalm 37:21. A good man is not only a man that has the good work of grace in him, and is ready to every good work; but one that is munificent, bountiful, and liberal; in which sense the word is used in Romans 5:7 and so in Latin writers (n).
He will guide his affairs with discretion; his civil and domestic affairs: he will act the part of a good economist; so that he may be able to support his family with credit and reputation, and have something to give to the relief of those in want. Some restrain this to his acts of charity. He lends to some, and gives to others: he takes care that they to whom he gives are proper objects of charity; he gives to persons seasonably, and in proportion to his own ability and their wants. It may be rendered, "he shall guide his words with judgment" (o); take care of what he says, and before whom; and that it be at a proper time and place; and especially when speaking of spiritual and religious things.
(n) "Bonus est hic homo", Plauti Poenulus, Acts. 5. Sc. 4. v. 42. "Vellet bonus atque benignus", Horat. Satyr. I. 1. Sat. 2. v. 51. "Piso bonus", Juvenal. Sat. 5. v. 109. (o) "verba sua in, vel cum, judicio", Pagninus, Montanus, Musculus, Cocceius, Gejerus.

Generosity, sound judgment in business, and confidence in God, form a character which preserves from fear of evil and ensures success against enemies. While a man thus truly pious is liberal, he increases in substance.

Lendeth - Gives freely to some, and lends to others according to the variety of their conditions. Affairs - His domestick affairs. Discretion - Not getting his estate unjustly, nor casting it away prodigally, nor yet withholding it from such as need it.