Who made heaven, etc. By all these epithets he confirms the truth previously stated. For though at first sight it may seem inappropriate to speak of the Creation, the power of God bears most pertinently upon his helping us whenever danger is near. We know how easily Satan tempts to distrust, and we are thrown into a state of trembling agitation by the slightest causes. Now, if we reflect that God is the Maker of heaven and earth, we will reasonably give him the honor of having the government of the world which he created in his hands and power. There is in this first ascription, then, a commendation of his power, which should swallow up all our fears. As it is not enough that God is merely able to help us, but as a promise is farther necessary, to the effect that he is willing and shall do it, David next declares that he is faithful and true, that, on discovering his willingness, no room may be left for hesitation.

Which made heaven and earth - Who is the true God, the Creator of all things. Happy is he who can address the God who called all this wondrous universe into being, and who sustains all by his power, as his God.
Which keepeth truth for ever - Who is always true to his promises. In this verse there are two reasons given why the lot of the people of God would be a happy one:
(1) That Yahweh is the true God, the Creator of all things, and, therefore, able to protect and provide for them.
(2) That he is faithful, and may always be relied on.
Idol-gods have no power, and every reliance placed on them is a vain reliance; people are often false and cannot be trusted, but Yahweh has infinite power, and every promise that he makes will be fulfilled; all that he says is eternally and unchangeably true. The reasons for trusting in him, or the reasons why they who trust in him are "happy," are further stated in the following verses.

Which made (d) heaven, and earth, the sea, and all that therein [is]: which keepeth truth for ever:
(d) He encourages the godly to trust only in the Lord, both in his power's ability to deliver them from all danger, and for his promise sake, as his will is most ready to do it.

Which made heaven and earth, the sea, and all that therein is,.... This and the following verses are a description of that divine Person, even Christ, who is the help and hope of his people; and every character of him is a reason for faith and hope in him; all things are made by him, which are in the whole compass of creation, the heaven, earth, and sea, and all in them; the fowls of the airy heaven; the sun, moon, and stars, the hosts of the starry heavens; and the angels, the inhabitants of the third heaven; the beasts of the field, and cattle of a thousand hills; and man, the chief of God's works on earth; and the innumerable fishes of the sea, great and small; and he that made all these, what is it he cannot do? he must be the mighty God, and a mighty Saviour, and the proper object of trust and hope; see John 1:1;
which keepeth truth for ever; the truth of doctrine, who as Mediator is full of it, and by whom it came; and, as the Prophet of the church, concealed it not, from the great congregation, the law of truth being in his lips, as the antitype of Levi; the truth of the promises, which are all yea and amen in him; every promise being made to him, and being in him, as the promise of eternal life, with all others, which are safely kept by him, and he will see them performed; the truth of all his engagements with his Father, as the surety of his people; to take their nature, obey, suffer, and die for them, which he has truly and punctually made good, being faithful to him that appointed him; and the truth of all his sayings, concerning his presence with his church and ministers unto the end of the world, and of whatsoever should befall them, from his resurrection and ascension to his second coming.

For ever - Both because he liveth for ever to fulfil his promises, and because he is eternally faithful.