His perception of human nature is that: 1) we are all mortal, in other words, life is formulated with birth and death is eminent for every being living. 2) Humans are rational creatures and retain humanity and therefore should aim to be moral. 2) Reason is a special faculty, unique only to human beings, which connects them to some truth about their own nature and essential concepts; these concepts are universal, timeless and immutable. Even sensation, beauty, relationships and possessions pass and die, they do not possess permanence. The only thing that remains with you is your reason. A serious philosophical error, a source of supreme suffering for human beings, is to forget, ignore or recognize that things die and nothing lasts