Rabbi Yaron Reuven brings Chiddushim on Parashat Behaalotecha and the danger of wanting more. In the Parasha the people had it really good, but the rabble started talking about the food in Egypt and this led to a horrible chain of events. Ramban says, they began desiring this food instead of the manna and that made them severely agitated. They started to think it was better when they were in Egypt and what came next was a severe rebuke from HaShem.