No matter how much a situation just ticked you off, don’t try to get revenge.
No matter how upset you got over not being selected for something, shrug it off and find a bigger and better project to be involved in.
If there is an issue that is frustrating you, but you know you can do something about it, then go do something about it.
Every day we each face something that disappoints us. Those that can roll with the punches, stay positive and see the silver lining in these occurances will be leaps and bounds ahead of the naysayers.