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 66:1The writer invites all men to unite in praise, cites some striking occasions for it, promises special acts of thanksgiving, and celebrates God's great mercy. (Psa. 66:1-20)
Make . . . noise--or, "Shout."
psa 66:2his name--as in Psa 29:2.
make his praise glorious--literally, "place honor, His praise," or, "as to His praise"; that is, let His praise be such as will glorify Him, or, be honorable to Him.
psa 66:3A specimen of the praise.
How terrible--(Compare Psa 65:8).
submit--(Compare Margin), show a forced subjection (Psa 18:44), produced by terror.
psa 66:5The terrible works illustrated in Israel's history (Exo 14:21). By this example let rebels be admonished.
psa 66:7behold the nations--watch their conduct.
psa 66:8Here is, perhaps, cited a case of recent deliverance.
psa 66:9holdeth . . . in life--literally, "putteth our soul in life"; that is, out of danger (Psa 30:3; Psa 49:15).
to be moved--(Compare Psa 10:6; Psa 55:22).
psa 66:10Out of severe trials, God had brought them to safety (compare Isa 48:10; Pe1 1:7).
psa 66:11affliction--literally, "pressure," or, as in Psa 55:3, "oppression," which, laid on the
loins--the seat of strength (Deu 33:11), enfeebles the frame.
psa 66:12men to ride over our heads--made us to pass.
through fire, &c.--figures describing prostration and critical dangers (compare Isa 43:2; Eze 36:12).
wealthy--literally, "overflowing," or, "irrigated," and hence fertile.
psa 66:13These full and varied offerings constitute the payment of vows (Lev 22:18-23).
psa 66:15I will offer--literally, "make to ascend," alluding to the smoke of burnt offering, which explains the use of "incense."
incense--elsewhere always denoting the fumes of aromatics.
psa 66:16With these he unites his public thanks, inviting those who fear God (Psa 60:4; Psa 61:5, His true worshippers) to hear. He vindicates his sincerity, inasmuch as God would not hear hypocrites, but had heard him.
psa 66:17he was extolled with my tongue--literally, "exaltation (was) under my tongue," as a place of deposit, whence it proceeded; that is, honoring God was habitual.
psa 66:18If I regard iniquity in my heart--literally, "see iniquity with pleasure."