New Defender's Study Bible Notes
145:1 for ever and ever. The five doxology psalms, ending respectively the five Books in the Psalms (Psalms 41, 72, 89, 106, 145), contain a total of 153 verses, with the final verse (the doxology) in each psalm speaking of the eternal blessedness of the redeemed with the Lord. See note below on Psalm 145:21. On the corresponding significance of the number 153, see note on John 21:11.
145:4 praise thy works to another. This wonderful message of God’s work of creation and redemption has indeed been transmitted from generation to generation ever since Adam (Deuteronomy 6:7; 11:19; Psalm 22:30,31; 78:5-7; Isaiah 38:19).
145:17 righteous in all his ways. Whether we understand it or not, whatever God does is right, by definition! See Psalm 33:4.
145:20 wicked will he destroy. It should never be forgotten that heaven and hell are eternal realities; there are two roads and two destinies. God will preserve forever in heaven those who love Him. See Matthew 7:13,14; 25:46; John 3:36; and Romans 2:6-11; etc.
145:21 bless his holy name. Each of the five books of the Psalms ends with a similar doxology (note Psalm 41:13; 72:19; 89:52; 106:48). The last five psalms may then be taken as a special Epilogue to the entire book.