The principle of reciprocity according to which Confucius said that we should act towards one another.  "What you do not want done to yourself, do not do to others."

The principle of reciprocity, also known as the "Golden Rule," is a fundamental ethical principle that exists in some form in nearly every religion and ethical tradition. According to Confucius, this principle suggests that we should interact with others in the same way we would want them to interact with us.

Here are the steps to understand this principle:

1. Identify your actions: Think about your actions and how they affect others. This includes your words, deeds, and attitudes.

2. Consider your feelings: Imagine yourself in the place of the person affected by your actions. How would you feel if someone did the same to you?

3. Evaluate your actions: If you would feel hurt or wronged by such actions, then it is likely not a good action to take.

4. Adjust your behavior: Try to treat others as you would want to be treated. This doesn't mean treating everyone exactly the same, but considering their feelings, needs, and perspectives as you would want yours to be considered.

5. Practice empathy: The principle of reciprocity is essentially about empathy. It's about understanding and sharing the feelings of others.

6. Repeat: This is not a one-time process but a continuous one. We should always be mindful of our actions and their effects on others.

In summary, the principle of reciprocity according to Confucius is about empathy and respect for others. It's about treating others as you would want to be treated.