Rarely do our actions effect only ourselves. Whether we intend to or not, the decisions we make touch the lives of everyone around us. The times we act before thinking will most likely be followed by regret.
Before you make a rash decision, or throw care to the wind about what you will do next, think about who it will effect. Not just the people closest to you either, but those 2 and 3 degrees removed. What about the long term ramifications?
It's easy to forget the domino at the end of the line as you tip the first. But eventually that final domino will fall, and where will it land? Perhaps you should consider that before starting the chain reaction. Our spheres of influence are typically larger than anticipated, and it's not until we make a wrong choice that we see it's reach.