No matter where I sit, no matter where I am or what is going on, I should be content with where I am because Christ is with me. I am missing out on nothing because I have Christ with me who is all things.
On their journey out of Egypt into the promise land, the Israelites were not content and satisfied with what they were receiving from the Lord.
The Lord was walking them into their blessing and He wanted them to believe for more and everything He had promised, but they were so focused on what they did not have, and what they were missing out on, that their complaints caused them to miss God's blessing. The blessings were passed on to their children instead and that generation did not get to see God's promise.
The moral of the story is be satisfied with what you have, while expecting and believing the Lord for more.