Recently I've had a lot of stuff going on. I've found myself thinking more and more about whether this thing will happen or whether that thing will work out. It's ratcheted up the stress and racheted down peace of mind in my life.
Then I read a great piece of advice -- "Think of each day in your life as an air-tight compartent, each separate from and independent from the other."
During each day, don't think about past days or future days. Just manage each one day by itself until the sun sets. If you do this well, your stress will come down and future days will take care of themselves.
It's a great formula for ratcheting down worry and racheting up peace of mind.