Under the direction of her Confessor, St Teresa of Ávila wrote about her spiritual journey in ‘The Interior Castle’.This was inspired by her vision of the soul as a diamond in the shape of a castle containing seven mansions, which she interpreted as the journey of faith through seven stages, ending with union with God.In this episode, Fr Carl Telford SM gives us an overview on the life of St Teresa and how her writings are a blueprint for experiencing prayer as a mystical union with God.