Part I: Theory and Research -- Humanistic Psychology and Self-Acceptance -- Self-Acceptance in Buddhism and Psychotherapy -- Self Acceptance and Christian Theology -- The Value of a Human Being -- Psychologically Flexible Self-Acceptance -- Unconditional Positive Self-Regard -- Unconditional Self-Acceptance and Self-Compassion -- Self-Acceptance and Happiness -- Measuring and Characterizing Unconditional Self-Acceptance -- Part II: Practice -- Self-Acceptance in the Education and Counseling of Young People -- Self-Acceptance and the Parenting of Children -- Self-Acceptance and Successful Relationships -- Self-Acceptance in Women -- Self-Acceptance and Chronic Illness -- Self-Acceptance and Aging: Using Self-Acceptance as a Mediator of Change in CBT with Older People