The basic law of behavior consists of body and soul.
Body is a tangible factor of life composition, which belongs to the research category of medicine and life science. Soul is an intangible factor of life composition, which belongs to the research category of behavior. The soul can't leave the body, and the body can't lack the soul.
The human soul contains two elements: character and knowledge.
Personality is an innate behavioral instinct, including desire, emotion and cognition. Knowledge is the behavioral basis obtained through learning, including customs, skills, scientific and cultural knowledge and ideology. Everyone's soul will not be the same, because everyone's innate character and acquired knowledge will not be exactly the same. So everyone has their own behavioral characteristics, that is, everyone's unique personality. Among the two elements of the soul, knowledge is dominant compared with knowledge. A knowledgeable person can overcome many weaknesses in his personality and make his behavior rational and predictable. People with poor knowledge are relatively poor in reason, or bold, or bold, or timid, and their behavior can only be dominated by their own personality.