Plasticity

Philip K. Dick, from The Selected Letters of Philip K. Dick 1972-1973:

A person's authentic nature is a series of shifting, variegated planes that establish themselves as he relates to different people; it is created by and appears within the framework of his interpersonal relationships.

Biological anthropologist Helen Fisher in This Will Make You Smarter: New Scientific Concepts to Improve Your Thinking:

Personality is composed of two fundamentally different types of traits: those of ‘character;’ and those of ‘temperament.’ Your character traits stem from your experiences. Your childhood games; your family’s interests and values; how people in your community express love and hate; what relatives and friends regard as courteous or perilous; how those around you worship; what they sing; when they laugh; how they make a living and relax: innumerable cultural forces build your unique set of character traits. The balance of your personality is your temperament, all the biologically based tendencies that contribute to your consistent patterns of feeling, thinking and behaving. As Spanish philosopher, Jose Ortega y Gasset, put it, ‘I am, plus my circumstances.’ Temperament is the ‘I am,’ the foundation of who you are.