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1 Make a joyful noise unto the LORD, all ye lands. 2 Serve the LORD with gladness: come before his presence with singing. 3 Know ye that the LORD he is God: it is he that hath made us, and not we ourselves; we are his people, and the sheep of his pasture. 4 Enter into his gates with thanksgiving, and into his courts with praise: be thankful unto him, and bless his name. 5 For the LORD is good; his mercy is everlasting; and his truth endureth to all generations.
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[AD 430] Augustine of Hippo on Psalms 100:1
"Jubilate," therefore, "unto the Lord, all you lands" [Psalm 100:1]. This Psalm gives this exhortation to us, that we jubilate unto the Lord. Nor does it, as it were, exhort one particular corner of the earth, or one habitation or congregation of men; but since it is aware that it has sown blessings on every side, on every side it does exact jubilance. Does all the earth at this moment hear my voice? And yet the whole earth has heard this voice. All the earth is already jubilant in the Lord; and what is not as yet jubilant, will be so. For blessing, extending on every side, when the Church was commencing to spread from Jerusalem throughout all nations, [Luke 24:47] everywhere overturns ungodliness, and everywhere builds up piety: the good are mingled with the wicked throughout all lands. Every land is full of the discontented murmurs of the wicked, and of the jubilance of the good. What then is it, "to jubilate"? For the title of the present Psalm especially makes us give good heed to this word, for it is entitled, "A Psalm of confession." What means, to jubilate with confession? It is the sentiment thus expressed in another Psalm: "Blessed is the people that understands jubilance." Surely that which being understood makes blessed is something great. May therefore the Lord our God, who makes men blessed, grant me to understand what to say, and grant you to understand what ye hear: "Blessed is the people that understands jubilance." Let us therefore run unto this blessing, let us understand jubilance, let us not pour it forth without understanding. Of what use is it to be jubilant and obey this Psalm, when it says, "Jubilate unto the Lord, all you lands," and not to understand what jubilance is, so that our voice only may be jubilant, our heart not so? For the understanding is the utterance of the heart.

Source: Exposition on Psalm 100
[AD 430] Augustine of Hippo on Psalms 100:2
"O serve the Lord with gladness" [Psalm 100:2]: he addresses you, whoever you are who endure all things in love, and rejoice in hope. "Serve the Lord," not in the bitterness of murmuring, but in the "gladness of love." "Come before His presence with rejoicing." It is easy to rejoice outwardly: rejoice before the presence of God. Let not the tongue be too joyful: let the conscience be joyful. "Come before His presence with a song."

Source: Exposition on Psalm 100
[AD 458] Theodoret of Cyrus on Psalms 100:2
“Serve the Lord with gladness,” for the kingship of our God and Savior has nothing of the harsh tyranny of the devil; rather, his lordship is mild and loving.

Source: COMMENTARY ON THE PSALMS 100:1
[AD 430] Augustine of Hippo on Psalms 100:3
"Enter into His gates with confession" [Psalm 100:3]. At the gates is the beginning: begin with confession. Thence is the Psalm entitled, "A Psalm of Confession:" there be joyful. Confess that you were not made by yourselves, praise Him by whom you were made. Let your good come from Him, in departing from whom you have caused your evil. "Enter into His gates with confession." Let the flock enter into the gates: let it not remain outside, a prey for wolves. And how is it to enter? "With confession." Let the gate, that is, the commencement for you, be confession. Whence it is said in another Psalm, "Begin unto the Lord with confession." What he there calls "Begin," here he calls "Gates." "Enter into His gates in confession." What? And when we have entered, shall we not still confess? Always confess Him: you have always what to confess for. It is hard in this life for a man to be so far changed, that no cause for censure be discoverable in him: you must needs blame yourself, lest He who shall condemn blame you. Therefore even when you have entered His courts, then also confess. When will there be no longer confession of sins? In that rest, in that likeness to the Angels. But consider what I have said: there will there be no confession of sins. I said not, there will be no confession: for there will be confession of praise. You will ever confess, that He is God, thou a creature; that He is your Protector, yourself protected. In Him you shall be as it were hid. "Go into His courts with hymns; and confess unto Him." Confess in the gates; and when you have entered the courts, confess with hymns. Hymn are praises. Blame yourself, when you are entering; when you have entered, praise Him. "Open me the gates of righteousness," he says in another Psalm, "that I may go into them, and confess unto the Lord." Did he say, when I have entered, I will no longer confess? Even after his entrance, he will confess. For what sins did our Lord Jesus Christ confess, when He said, "I confess unto You, O Father"? [Matthew 11:25] He confessed in praising Him, not in accusing Himself. "Speak good of His Name."

Source: Exposition on Psalm 100
[AD 430] Augustine of Hippo on Psalms 100:3
But what is my God? I put my question to the earth. It answered, “I am not God,” and all things on earth declared the same. I asked the sea and the chasms of the deep and the living things that creep in them, but they answered, “We are not your God. Seek what is above us.” I spoke to the winds that blow, and the whole air and all that lives in it replied, “Anaximenes is wrong. I am not God.” I asked the sky, the sun, the moon and the stars, but they told me, “Neither are we the God whom you seek.” I spoke to all the things that are above me, all that can be admitted by the door of the senses, and I asked, “Since you are not my God, tell me about him. Tell me something of my God.” Clear and loud they answered, “God is he who made us.” I asked these questions simply by gazing at these things, and their beauty was all the answer they gave.

Source: Confessions 10.6
[AD 585] Cassiodorus on Psalms 100:3
“Serve the Lord in gladness; enter his sight with rejoicing.” But that joy is love, at any rate, which (as the apostle says) “is not puffed up, does no harm, is not ambitious” and all the other things which describe this excellent virtue in Paul’s marvelous explanation. Therefore, they are those who serve the Lord in gladness, who love him above all things and regard one another with brotherly love. Oh, what free bondage! Ah, a servitude more exceptional than all other forms of domination, to which such joy is ascribed as is not contained in the glory of kingdoms! But see what sort of reward follows that joy which is commanded in this world, for he says, “Enter his sight with rejoicing.” It is much more difficult and much more excellent to rejoice before the sight of such a judge, when one is being warned to approach with the knowledge so as to take the joys of humility while he is shown to be fearsome to all the haughty.

Source: EXPOSITIONS OF THE PSALMS 99:2
[AD 735] Bede on Psalms 100:3
We are taught by their testimonies that “it is God himself and not we ourselves who made us”—not only to be human beings but also to be holy and blessed human beings. If by the gift of his grace we pursue him eagerly, always with a pure and untiring heart, he will be propitious toward all our iniquities, according to the promises made to our ancestors. He will satisfy our desire with good things, he will crown us unto eternal life not as a reward for the works of justice that we have done of ourselves but in the compassion and mercy9 that he has given us, for he lives and reigns in the unity of the Holy Spirit, throughout all ages. Amen.

Source: Homilies on the Gospels 2:19
[AD 430] Augustine of Hippo on Psalms 100:4-5
"For the Lord is pleasant" [Psalm 100:4]. Think not that you faint in praising Him. Your praise of Him is like food: the more ye praise Him, the more ye acquire strength, and He whom you praise becomes the more sweet. "His mercy is everlasting." For He will not cease to be merciful, after He has freed you: it belongs to His mercy to protect you even unto eternal life. "His mercy," therefore, "is to everlasting: and His truth from generation to generation" [Psalm 100:5]. Understand by "from generation to generation," either every generation, or in two generations, the one earthly, the other heavenly. Here there is one generation which produces mortals; another which makes such as are everlasting. His Truth is both here, and there. Imagine not that His truth is not here, if His truth were not here, he would not say in another Psalm: "Truth is risen out of the earth;" nor would Truth Itself say, Lo, I am with you always, even unto the end of the world. [Matthew 28:20]

Source: Exposition on Psalm 100