In the natural world, the human species is unique because of its spiritual nature. This potent of human nature is for boon or ruin of human life. Neuroscience reveals a neural basis for the spiritual human nature and neurobiological underpinnings in spiritual health. This suggests spiritual health is not an add-on of culture. Spiritual health results from the evolution of human consciousness and self-evolution. The science of spiritual health has yet to make its mark on ordinary people's thinking. I intend this book to serve as a bird-eye view of the new evolving science to affect change in personal health care matters. The book will show that the cultivation of spiritual health always aims to be deliberate, i.e., to recalibrate the imagination and willpower to advance the holistic human person and holistic life; thus improving the health of society and building a healthier humanity. The book discusses what neuroscience so far can tell us about the neurobiological underpinnings of spiritual health to emphasize that spiritual human nature is an innate potential for the fulfillment of human life and the "good life". It will help the reader recognize that the material trajectory of human nature - dominating human life in our world - only inadequately provides for the "good life". It underscores the implications of spiritual health on personal, social, and global health, as well as its relevance to the health of the planet. For some, the book could be an eye-opener on matters of spiritual health that may have not been considered previously. It underscores the "spiritual" is not a theological ideal or religious determinism. It points to the need to grow the holistic human person nature designed for us. It relies on the map of human nature, not religious utopias, to be guided correctly through the journey of life. This book delves into spiritual health as a component of health with implications for the individual, society, and humanity; as well as the planet. The book emphasizes that cultivating spiritual health has much to do with the brain mechanisms - neurobiological processes - that are unique to the human species. It is not about giving assent to religious doctrines or performing religious rituals. Doctrinaire religion offers very little, if nothing at all, to improve spiritual health as the avenue to holistic health, for holistic human development, or to build a healthier humanity and safer world. I hope that you will learn from this book the significance, requirements, and benefits of improving your spiritual health. This book probes into the human spirit of our times, mostly overlooked when seeking resolutions to human problems and global challenges of our times. It draws attention to the deep spiritual wounding in our world. It delves into the difference - generally overlooked - between the spiritual and religious phenomena to help the reader distinguish the "religious way of life" from cultivating spiritual health. Above all, it provides evidence-based practices and life-animating principles proven by health sciences to benefit spiritual health.