Jamieson, Fausset and Brown on Psalms 106:13-15

13-15. The faith induced by God's display of power in their behalf was short lived, and their new rebellion and temptation was visited by God with fresh punishment, inflicted by leaving them to the result of their own gratified appetites, and sending on them spiritual poverty (Nu 11:18).

They soon forgat--literally, "They hasted, they forgat" (compare Ex 32:8). "They have turned aside quickly (or, hastily) out of the way." The haste of our desires is such that we can scarcely allow God one day. Unless He immediately answers our call, instantly then arise impatience, and at length despair.

his works--(De 11:3, 4; Da 9:14).

his counsel--They waited not for the development of God's counsel, or plan for their deliverance, at His own time, and in His own way.