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 112:1This Psalm may be regarded as an exposition of Psa 111:10, presenting the happiness of those who fear and obey God, and contrasting the fate of the ungodly. (Psa 112:1-10)
True fear produces obedience and this happiness.
psa 112:2Temporal blessings follow the service of God, exceptions occurring only as they are seen by God to be inconsistent with those spiritual blessings which are better.
psa 112:4light--figurative for relief (Psa 27:1; Psa 97:11).
the upright--are like God (Luk 6:36; Psa 111:4).
psa 112:5Generosity, sound judgment in business, and confidence in God, form a character which preserves from fear of evil and ensures success against enemies. While a man thus truly pious is liberal, he increases in substance.
psa 112:6not be moved--(compare Psa 13:4; Psa 15:5).
psa 112:8heart is established--or, firm in right principles.
see his desire-- (Psa 50:23; Psa 54:7).
psa 112:10Disappointed in their malevolent wishes by the prosperity of the pious, the wicked are punished by the working of their evil passions, and come to naught.