| Barnes' Notes on the Bible Praise the Lord, for the Lord is good - See Psalm 107:1. Sing praises unto his name, for it is pleasant - See Psalm 33:1; Psalm 92:1. The idea here is, that it is a source of happiness, and that it is proper in itself.
Clarke's Commentary on the BibleThe Lord is good - Here is the first reason why he should be praised; and a second is subjoined: For it is pleasant - It is becoming to acknowledge this infinite Being, and our dependence on him; and it is truly comfortable to an upright mind to be thus employed.
Gill's Exposition of the Entire BiblePraise ye the Lord, for the Lord is good,.... Essentially and communicatively; he is good, and he does good, in a providential way, to all men; and in a way of special grace to his own people; for whom he has laid up and to whom he has promised good things, and on whom he bestows them; as pardon, righteousness, and eternal life; both grace and glory; and therefore they should praise him; sing praises unto his name, for it is pleasant; either the work of singing praise is pleasant, being the employment of angels and glorified saints; the subject matter of it delightful, the blessings of grace flowing from the everlasting love of God it leads unto, which is excellent and better than life; and it must be pleasant work to a saint, because it is pleasing to God; and especially when the presence of God is enjoyed in it, and melody is made in the heart as well as with the mouth. Or the sense is, "his name is pleasant"; so Aben Ezra and Kimchi interpret it: for though it is holy and reverend in itself, and fearful and terrible to sinners; yet as it is proclaimed in Christ, it is exceeding delightful, and in whom all the perfections of God are glorified; particularly the name of God, as a covenant God and Father in Christ, blessing, with all spiritual blessings in him, is exceeding pleasant; as are all the names of Christ, and therefore to be praised.
Geneva Study BiblePraise the LORD; for the LORD is good: sing praises unto his name; for it is pleasant.
Matthew Henry's Concise Commentary135:1-4 The subject-matter of praise, is the blessings of grace flowing from the everlasting love of God. The name of God as a covenant God and Father in Christ, blessing us with all spiritual blessings in him, is to be loved and praised. The Lord chose a people to himself, that they might be unto him for a name and a praise. If they do not praise him for this distinguishing favour, they are the most unworthy and ungrateful of all people.
Matthew Henry's Whole Bible CommentaryPSALM 135 This is one of the Hallelujah-psalms; that is the title of it, and that is the Amen of it, both its Alpha and its Omega. I. It begins with a call to praise God, particularly a call to the "servants of the Lord" to praise him, as in the foregoing psalm (v. 1-3). II. It goes on to furnish us with matter for praise. God is to be praised, 1. As the God of Jacob (v. 4). 2. As the God of gods (v. 5). 3. As the God of the whole world (v. 6, 7). 4. As a terrible God to the enemies of Israel (v. 8-11). 5. As a gracious God to Israel, both in what he had done for them and what he would do (v. 12-14). 6. As the only living God, all other gods being vanity and a lie (v. 15-18). III. It concludes with another exhortation to all persons concerned to praise God (v. 19-21). In singing this psalm our hearts must be filled, as well as our mouths, with the high praises of God. Verses 1-4 Here is, 1. The duty we are called to-to praise the Lord, to praise his name; praise him, and again praise him. We must not only thank him for what he has done for us, but praise him for what he is in himself and has done for others; take all occasions to speak well of God and to give his truths and ways a good word. 2. The persons that are called upon to do this-the servants of the Lord, the priests and Levites that stand in his house, and all the devout and pious Israelites that stand in the courts of his house to worship there, v. 2. Those that have most reason to praise God who are admitted to the privileges of his house, and those see most reason who there behold his beauty and taste his bounty; from them it is expected, for to that end they enjoy their places. Who should praise him if they do not? 3. The reasons why we should praise God. (1.) Because he whom we are to praise is good, and goodness is that which every body will speak well of. He is good to all, and we must give him the praise of that. His goodness is his glory, and we must make mention of it to his glory. (2.) Because the work is its own wages: Sing praises to his name, for it is pleasant. It is best done with a cheerful spirit, and we shall have the pleasure of having done our duty. It is a heaven upon earth to be praising God; and the pleasure of that should quite put our mouths out of taste for the pleasures of sin. (3.) Because of the peculiar privileges of God's people (v. 4): The Lord hath chosen Jacob to himself, and therefore Jacob is bound to praise him; for therefore God chose a people to himself that they might be unto him for a name and a praise (Jer. 13:11), and therefore Jacob has abundant matter for praise, being thus dignified and distinguished. Israel is God's peculiar treasure above all people (Ex. 19:5); they are his Segullah, a people appropriated to him, and that he has a delight in, precious in his sight and honourable. For this distinguishing surprising favour, if the seed of Jacob do not praise him, they are the most unworthy ungrateful people under the sun. | 
