Manna

I was talking with a friend yesterday and the concept of the Israelites came up... specifically, how often we feel like we can relate to the Israelites in the ease of complaining about situations. I mean, we read in the Bible how often they complained, but I don't think we sit down and think about the frequency of our complaints and how easy it is for us to stop trusting God.
Especially when God answers prayers. You see, the Israelites needed food, they prayed to God and asked, and he gave them manna (meaning - what is it?). They were happy (for a short while) and then began to grumble. My question - how much "manna" do I have in my life? Things I've prayed for... and then grumble about?
On the amazing list of things prayed for is Magnus (my husband), Magnus' new job (yay!), where we are living, being in seminary and so much more... yet how often do I start grumbling away at these things instead of continuing to remember these are kind blessings from the Lord?
More then I would like to admit. May my heart continue to learn to praise Jesus instead of grumble at the "what is it"s that I pray for.