Put simply, in order to be someone, we need someone to be someone for. Our personalities develop as a role we perform for other people, fulfilling the expectations we think they have of us.
Gurwinder • The Perils of Audience Capture

Because we are each an individual, infinitely complex being, our different physiological, environmental, and cultural variations bring us to infinite different endpoints. Like it or not, we all see the world slightly differently and our creative expressions reflect this.
View Profile • The A.I. Lie

Enneagram author and teacher Marylin Vancil describes this development in a helpful way. She refers to this as the “adapted self,” the self we believe we must be in order to survive and have our needs met.
Drew Moser • The Enneagram of Discernment: The Way of Vocation, Wisdom, and Practice
Human beings are works in progress that mistakenly think they’re finished. The person you are right now is as transient, as fleeting and as temporary as all the people you’ve ever been. The one constant in our lives is change.
Maria Popova • The Psychology of Your Future Self and How Your Present Illusions Hinder Your Future Happiness
we are each of us like a fountain, configured out of diverse, separate impulses, desires, attitudes and concerns that from a distance (seen by another person) give off an impression of being unified and coherent.