Murmuring or complaining is one of those sins that are overlooked. Sometimes we get so focused on the "big sins" such as murder and adultery that we overlook this sin — but the Lord doesn't give this sin a free pass — quite the opposite. It's a hidden killer! This sin unleashed a plague that killed thousands of Israelites! [Numbers 16]
Patience is one of those attributes that you cannot learn by reading about it. It's a quality that can only be acquired by persistent, enduring, practice– and for me it's a drill that I go over, and over, and over again!
There is an old Persian fable of a hen, a mouse, and a rabbit who lived together in a little house in the woods. They shared all the work and lived in harmony. The chicken found the firewood, the mouse brought the water from a nearby brook, and the rabbit cooked the meals. Each did his work faithfully and contentedly.