We live in troubled times: COVID-19, police racism, and climate change are just some of the challenges we are currently facing. Never has there been such a need for a new politic - nor such an opportunity for one. To create a world in which people thrive, we need to know what thriving is. Over the past century, psychotherapy - and its parent discipline, psychology - has built up a rich, vibrant, and highly practical understanding of human wellbeing and distress. This book shows why we need, and can create, a progressive politics that is profoundly informed by insights from the psychotherapeutic and psychological domain, moving us from a politics of blame to a politics of understanding. In this vision of the world -- surrounded by a culture of radical acceptance - all individuals can live fulfilling lives. We need progressive political forces to develop greater understandings of psychological needs and processes; and to work with others in a spirit of collaboration, dialogue and respect. 'Have you ever wondered what psychology can do to make a positive contribution to building a sustainable and more just society? Cooper offers a comprehensive framework for how to use psychotherapeutic principles to revitalise progressive political practice.' — John McLeod, Abertay University 'A very powerful case for integrating the insights of humanistic psychology into activism. Being more honest, accepting and compassionate, as well as showing our vulnerability, would undoubtedly get us a lot further.' — Peter Baker, Director, Global Action on Men’s Health