Marcus Aurelies wrote about his six timeless observations on life. They're on the money, and also apply to riding.
Lesson #1: We Are Responsible for Our Own Experience of Life
Sure, they'll cut you off, signal right then turn left, but it's you, the rider, that's responsible for your safety on the road. How far do you follow? Do you always signal? Is your helmet black or yellow?
Lesson #2: Everything Changes
Never assume the road that you ride to work on everyday will be the same tomorrow. New pavement, a dropped bucket of wet paint in the lane, or the worst time ever for your side luggage to come open, everything changes. It's how we deal with it that matters.
Lesson #3: Live a Real Life
Fear no ride. You live a real life because you ride. You chose to ignore all the "my uncle died on a bike" stories and enjoy it, even if there is a risk. Its risk that gives reward.
Lesson #4: Be Grateful
Wave at the guy that let you squeeze into the lane. Be happy that you noticed the smell of fresh bread being baked on the ride to work today, be excited that you enjoy your trip to and from work because you're on two, very fast, wheels.
Lesson #5: Be Detached
So what if that minivan flicked you off. No big deal that the Harley guy just passed you in the bus only lane wearing only shorts and sunglasses. It's his choice. Focus on what you can affect.
Lesson #6: All Is Well
All is indeed well. You live in a country that gives you anything you want, anytime you want it. There is nothing to complain about if you are an American. Our system gives you the opportunity to change it. In the end, all is well. Life is good.