traits and behaviors associated to a single individual that allows them to be
particular and uncommon in one way or another from other individuals. The idea of
individual differences in terms of its origin has been long since questioned,
debated and remains somewhat inconclusive. Philosophers often believe in the
ideologies of the human soul in relation to understanding the root and presence of
individual differences and personality. For instance, Plato believed the human soul
(mind) consisted of three parts; reason, appetite (physical urges) and will
(emotion, passion and spirit). In his fourth book of the Republic, he claims that
each individual has only one soul, and that it cannot be in one state and its
opposite simultaneously. According to Plato�s view of reason, he declared the humans view of reason, he declared the human
soul can only be governed justly if all three parts of the soul are in agreement
that it is reason that should rule. With a just soul, a human�s view of reason, he declared the humans spirit (part of the
soul that causes temper) will align with reason and not succumb to the temptation
of appetite, thereby achieving the desire to be good. Lastly, the appetitive is the
part of the soul that fuels erotic love, hunger and thirst; any desire opposed to
reason. This alone is one complex ideology about understanding the roots of the
human condition, and human personality. With the evolution of psychology, as awry
from philosophy, a brand new school of psychology emerged known as differential
psychology. This branch of psychology is a taxonomy built on the roots of
understanding human behavior and the causes that underlie it. Differential
psychology aims to study aspects of the human condition such as personality,
temperament, intelligence, motivation and various other widely varying topics.