A Key was first written for those who misunderstood the Society of Friends as it began. Its clarity provides a message for modern Friends, reminding all of what we properly are and what we are not. In a period of complex and rapid change, new patterns of religious thought, expression, and practice appear. The present-day emphasis on the practicalities of putting historic principles into action may eclipse deeper inward and contemplative understanding of Christian belief. It strengthens our faith to review fundamental concepts that guided Friends of the first generations. A Key may provide a perspective on the past, the present, and prospects for the future.