145:8-10 Verses 8 and 9 are a classic expression of praise for God's character. The same statement in Hebrew occurs in six other places in the Old Testament (Exod. 34:6; Neh. 9:7; Pss. 86:15; 103:8; Joel 2:13; Jonah 4:2). God's grace is His undeserved favor and divine enablement that He gives to those who do not deserve it. His mercy is the forbearance He demonstrates to those who deserve His wrath. He is patient with those who arouse His anger with their sinning. His loyal love is amazingly strong and long lasting. He is good to everyone even sending rain and many other blessings on the unjust as well as the just. Moreover He exercises His powerful works under the constraints of His mercy.
Because of these things all of God's works and people will praise Him (v. 10).
145:11-13a God's faithful and consistent control of all things from one generation to the next call for praise of His eternal reign. He rules over all with power and glory. People speak of the great King and His kingdom because of all His wondrous acts.
145:13b-16 The NASB translators did not translate the last portion of verse 13. It reads, "The LORD is faithful to all His promises and loving toward all He has made"(NIV). He consistently sustains the fallen, uplifts the oppressed, and provides for all. Therefore every person looks to God for His provision of needs. Since God's dominion is everlasting He cares for His creatures faithfully and lovingly all the time.
