The anthology is comprised of three parts. The first part includes excerpts from major classics of spirituality that introduce the foundations of the way of the invocation in various traditions. With these texts the reader is provided with an entry into some of the most celebrated sacred sources that have quenched the spiritual thirst of generations of faithful. A second part consists of doctrinal essays by contemporary scholars who have been expositors of the principles of the way of the invocation. It is hoped that this series of texts will help elucidate in a contemporary conceptual idiom all that may have remained obscure elliptical or implicit in foundational classics. In conclusion the final section of this volume is focused on contemporary testimonies by spiritual and literary figures from various traditions who have taught advocated or simply illustrated the path of the invocation. In giving the final word to these voices of sages and saintly or literary figures the editor wishes to provide the reader with an opportunity to taste the spiritual flavour and inspiration of the invocatory path while suggesting the relevance actuality and accessibility of this way in the modern world.