In the Old Testament the Children of God really use to celebrate after they had a major victory. There really was a big party after they saw the Egyptians drowned in the Red Sea, for instance.

They sang songs then, which we still sing today. “I will sing unto the Lord for He has triumphed gloriously..” Yet within 3 verses they were moaning and complaining against Moses. He soon got that problem sorted for them but within another 3 verses they were doing it all over again. Their rejoicing was short lived and completely dependent upon their circumstances. When things were going their way they were happy but when things went wrong they moaned again and it happened like this time and time again.