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 62:1To Jeduthun--(See on Psa 39:1, title). The general tone of this Psalm is expressive of confidence in God. Occasion is taken to remind the wicked of their sin, their ruin, and their meanness. (Psa 62:1-12)
waiteth--literally, "is silent," trusts submissively and confidently as a servant.
psa 62:2The titles applied to God often occur (Psa 9:9; Psa 18:2).
be greatly moved-- (Psa 10:6). No injury shall be permanent, though devised by enemies.
psa 62:3Their destruction will come; as a tottering wall they already are feeble and failing.
bowing wall shall ye be--better supply "are." Some propose to apply these phrases to describe the condition of "a man"--that is, the pious suffer: thus, "Will ye slay him," &c.; but the other is a good sense.
psa 62:4his excellency--or, elevation to which God had raised him (Psa 4:2). This they try to do by lies and duplicity (Psa 5:9).
psa 62:5(Compare Psa 62:1-2).
psa 62:6not be moved--not at all; his confidence has increased.
psa 62:7rock of my strength--or strongest support (Psa 7:10; Psa 61:3).
psa 62:8pour out your heart--give full expression to feeling (Sa1 1:15; Job 30:16; Psa 42:4).
ye people--God's people.
psa 62:9No kind of men are reliable, compared with God (Isa 2:22; Jer 17:5).
altogether--alike, one as the other (Psa 34:3).
psa 62:10Not only are oppression and robbery, which are wicked means of wealth, no grounds of boasting; but even wealth, increasing lawfully, ought not to engross the heart.
psa 62:11once; twice--(as in Job 33:14; Job 40:5), are used to give emphasis to the sentiment. God's power is tempered by His mercy, which it also sustains.
psa 62:12for thou renderest--literally, "that Thou renderest," &c., connected with "I heard this," as the phrase--"that power," &c. [Psa 62:11] --teaching that by His power He can show both mercy and justice.