Complete Commentary on the Whole Bible, by Matthew Henry, at sacred-texts.com
(Psa 145:1-9) David extols the power, goodness, and mercy of the Lord.
(Psa 145:10-21) The glory of God's kingdom, and his care of those that love him.
Those who, under troubles and temptations, abound in fervent prayer, shall in due season abound in grateful praise, which is the true language of holy joy. Especially we should speak of God's wondrous work of redemption, while we declare his greatness. For no deliverance of the Israelites, nor the punishment of sinners, so clearly proclaims the justice of God, as the cross of Christ exhibits it to the enlightened mind. It may be truly said of our Lord Jesus Christ, that his words are words of goodness and grace; his works are works of goodness and grace. He is full of compassion; hence he came into the world to save sinners. When on earth, he showed his compassion both to the bodies and souls of men, by healing the one, and making wise the other. He is of great mercy, a merciful High Priest, through whom God is merciful to sinners.
All God's works show forth his praises. He satisfies the desire of every living thing, except the unreasonable children of men, who are satisfied with nothing. He does good to all the children of men; his own people in a special manner. Many children of God, who have been ready to fall into sin, to fall into despair, have tasted his goodness in preventing their falls, or recovering them speedily by his graces and comforts. And with respect to all that are heavy laden under the burden of sin, if they come to Christ by faith, he will ease them, he will raise them. He is very ready to hear and answer the prayers of his people. He is present every where; but in a special way he is nigh to them, as he is not to others. He is in their hearts, and dwells there by faith, and they dwell in him. He is nigh to those that call upon him, to help them in all times of need. He will be nigh to them, that they may have what they ask, and find what they seek, if they call upon him in truth and sincerity. And having taught men to love his name and holy ways, he will save them from the destruction of the wicked. May we then love his name, and walk in his ways, while we desire that all flesh should bless his holy name for ever and ever.