God hath spoken once; twice have I heard this - This repetition, or this declaration that he had heard the thing repeated, is designed to give emphasis to what was said, or to call attention to it as particularly worthy of notice. See the notes at Job 33:14. Compare Job 40:5. The sentiment here is particularly important, or is deserving of special attention, because, as the psalmist had shown, all other resources fail, and confidence is to be placed in nothing else for that which man so much needs; neither in people, whether of low degree or high Psalms 62:9; not in oppressive acts - acts of mere power; not in plunder; not in wealth, however acquired, Psalms 62:10.
That power belongeth unto God - Margin, strength. The idea is, that the strength which man needs - the ability to defend and to save him - is to be found in God. All else may fail, but the power of God will not fail. The result of all, therefore, should be to lead us to put our trust in God alone.