Whatever clever we are, we just do most of the things from top of the mind. We do something when others watch us and we tend to do totally different thing when there are no one around us[another variation is when you are near a person know to you versus when a stranger is watching you].
You can have any value system (it evolves or degrades over time, i m not commenting anything on the value system) but make sure that it is available at the top of your mind. In a very passionate/emotional situation, we tend to do things from top of the mind. If you happen to do something against your value system, just don't feel sorry. But make sure that you make an initiative to bring the value system to the top of your mind.
More than thinking, "top of the mind thinking" is more relevant in day-to-day decision making.
Once you do that, you will never feel sorry in life (buying certain things that you dont need, deciding on your next job, taking an extra scoop of ice cream in Baskin Robbins, dieting and life style changes that we are trying to alter everyday etc).
