Maximus

Aristotle said, "The happy life for a man is a life of consciously following a rule."

A rule is a pre-formulated guide
1 - in new situations
2 - and against simple-minded emotions.

1. Rules tell you what to do when you don't have time to think .

In a new situation, you don't have time to figure out the best course of action.

If you've thought about similar situations before, you can use the conclusions you've already drawn as a handy guide.

2. Rules protect you from simple-minded emotions.

Initial reactions are fast, uninformed and simplistic. That allows them to trigger powerful, misleading emotions.

If you've thought about similar situations before, your conclusions can be a handy alternative to the guidance offered by your emotions.