Flexibility was a cornerstone of psychologist Timothy Leary’s work: He introduced new frameworks for group therapy and the therapist-patient relationship. Leary is best known for his studies on the transformative effects of psychedelic drugs, which led him to conclude that some hallucinogens can positively influence personality or outlook. While Leary’s research remains controversial, his takeaway hits on a universal truth: By remaining flexible and willing to change our minds, we give ourselves more room to grow, expand our perspective, and live a fulfilling life.