thanklessness

Psalm.78:20 . can he give bread also ? Can he provide flesh for his people ?
21 Therefore the Lord heard this , and was wroth :so a fire was kindled against Jacob, and anger also came up against Israel:
22. Because they believed not in God , and trusted not in his salvation;
23. Though he had commanded the clouds from above , and opened the doors of heaven.
24. And had rained down manna upon them to eat , and had given them of the corn of heaven.
25. Man did eat angel's food : he sent them meat to the full.
26.He caused an east wind to blow in the heaven; and by his power he brought in the south wind .
27. He rained flesh also upon them as dust , and feathered fowls like as the sand of the sea:
28. And he let it fall in the midst of their camp, round about their habitations;
29So they did eat and were well filled: for he gave them their own desire;
30.They were not estranged from their lust. But while their meat was yet in their mouths,
31. The wrath of God came upon them, and slew the fattest of them , and smote down the chosen men of Israel..
32. For all this they sinned still , and believed not for his wondrous works.
33. Therefore their days did he consume in vanity, and their years in trouble.