The distinctive characteristics, behavior and qualities portrayed in action and reaction by an individual. Personality is the bodily form through which individuality is expressed. It is the mask (from the Greek word Persona), not the real wearer. It is the earthly expression, the outward expression of an inner reality.
The personality that is expressed is formed at the moment of birth when the neurons of the brain are formed. The expression of spirit cannot make existence known on Earth except through personality.