A Commentary, Critical, Practical, and Explanatory on the Old and New Testaments, by Robert Jamieson, A.R. Fausset and David Brown  at sacred-texts.com
psa 111:1The Psalmist celebrates God's gracious dealings with His people, of which a summary statement is given. (Psa 111:1-10)
Praise ye the Lord--or, Hallelujah (Psa 104:35). This seems to serve as a title to those of the later Psalms, which, like this, set forth God's gracious government and its blessed fruits. This praise claims the
whole heart-- (Psa 86:12), and is rendered publicly.
upright--a title of the true Israel (Psa 32:11).
psa 111:2His works, that is, of providence and grace are
sought--or, carefully studied, by all desiring to know them.
psa 111:3honourable and glorious--literally, "honor and majesty," which illustrate His glorious perfections.
righteousness-- (Psa 7:17; Psa 31:1), which He has made memorable by wonders of love and mercy, in supplying the wants of His people according to covenant engagements.
psa 111:6His power was shown especially in giving them the promised land, and His faithfulness and justice thus displayed are, like His precepts, reliable and of permanent obligation.
psa 111:9The deliverance He provided accorded to His established covenant. Thus He manifested Himself in the sum of His perfections (Psa 20:1, Psa 20:7; Psa 22:3) worthy of reverence.
psa 111:10And hence love and fear of such a God is the chief element of true wisdom (compare Pro 1:7; Pro 9:10).