Lest We Lose Love is a most timely book that helps the reader to resume confidence in humanity’s future in the light of the present complex global crises. It enables people to find hope in our collective capacity to value what truly matters to our common life, sustain congenial relationships amongst all, and extend our caring to self, other people, and other beings on the planet. Few are aware that since antiquity, there has always been the philosophy of love at the core of Western culture. It articulates what makes life meaningful and worthwhile, and how we can live a good life together through an ethic of love. This book fills this significant gap, not only reconnecting the reader with such important wisdom, and more crucially, also reorienting our socio-economic institutions and collective actions towards more loving and caring, and more concerned with the qualities of our lived experiences. By re(dis)covering the gifts of love, we may challenge the existing systemic dehumanisation, and draw from knowledge and understanding already present in our culture. This is timely because the global crises we are facing are catastrophic, especially when it comes to climate change. Therefore we must respond from a place of love rather than fear. Whether it is reducing the use of fossil fuels, lowering greenhouse emission, choosing the right food to eat, or advocating for structural transformation, our concerted endeavours start with an appropriate appreciation of the nature of our well-being which includes the planet’s well-ness. This book highlights a clear pathway forward: to ensure collective healing and co-flourishing with nature, we must practise the art of loving. Although introducing conceptions of love developed throughout Western history of thought, this book is not a book of philosophy. Instead, it makes philosophical ideas of love more accessible to anyone who is interested in developing a better understanding of love and its evolution. It intends to awaken the reader to such claims about love that have been quietly speaking to humanity from the depth of the Western culture. In doing so, this book invites the reader to become curious about how and why love has been side-lined if not almost forgotten in the contemporary Western socio-economic systems and national and international politics. Ultimately, by re-familiarising ourselves with these articulations of love, this book urges us to embark on the paths of love and engage in those activities, processes, experiences and relationships that constitute the good life, and embrace the practices of love.