Know two sides
It is stated that if we know how other people behave, we are intelligent. If we know how to behave ourselves, we are wise. In reality, people are intelligent because most of them know or like to know how other people behave. Few people know themselves; they might know something shallow, for example, what kind of food they like. But they do not know their behaviour deeply in sense of ethics or morality. Therefore, we should intend to learn inside ourselves, not always outside, others. However, inside and outside are like two sides of a coin, we should know as it is supportive to life.