By sustaining us in the desert with Manna from heaven, G-d was teaching us a lesson for all time:
We are His creations and he takes care of our sustenance. In the Sinai desert he provided it through openly miraculous means. Today, he provides it through the cloak of nature and work.
Your boss, your employer, your client, is no more than a channel for G-d's sustenance to come your way. Sure, you must put in your effort, but only because that is how our Creator wants the system to work. But ultimately, the blessing comes from above.
So don't fret it. Whether you're working for money or gathering manna - it works the same way: Put your trust in G-d, make your best effort, and He will see to your needs.
Shabbat Shalom,
- Rabbi Yitzi Schmukler