St Teresa of Avila (1515-1582), first woman declared Doctor of the Church. In 'Interior Castle', Teresa uses the image of a castle as symbolic of the interior life. The castle has seven rooms, the seventh, in the center, holds the King of Glory representing union with God. One approaches the center by passing through the rooms of Humility, Practice of Prayer, Meditation, Quiet, Illumination and Dark Night. This book is a treasury of unforgetable maxims on self-knowledge and fulfillment.