In the unfolding of a true spiritual mission upon the Earth, the great teachers of humanity work together. An example of this working together to fulfill a spiritual mission for humanity is presented to us in this book. It is a matter in this work of a collaboration between two great spiritual teachers of humanity in the twentieth century: Rudolf Steiner (1861-1925) and Valentin Tomberg (1900-1973). Rudolf Steiner's life work culminated in the 'baptismal event' for the Second Coming of Christ expressed in the Foundation Stone of Love and clothed in the words of the Foundation Stone meditation. Valentin Tomberg, after his spiritual awakening in 1932, entered into the Mystery of Christ's Second Coming. His Studies on the Foundation Stone Meditation, published in critical years of world history (1936-1939), were written just a few years after his spiritual awakening. They penetrate into the Mystery of Christ's Second Coming by offering the reader access from within to the Foundation Stone meditation given to humanity by Christ through Rudolf Steiner. Every sentence of these studies - born of living experience undergone by Valentin Tomberg - leads the reader into the sublime mystery of the spirit awakening of humanity through Christ in our time. Understood as a manual for enlightenment, to be worked with meditatively over and over again, this work is one of the great treasures of humanity's spiritual literature - a priceless jewel for every spiritual seeker in our time.