Dr Peter Tyler is Senior Lecturer and Programme Director of Pastoral Theology at St Mary's University College, Twickenham, UK. Previous publications include St John of the Cross - Outstanding Christian Thinker (Continuum 2010), Sources of Transformation: Revitalising Christian Spirituality (edited with Edward Howells) (Continuum 2010) and The Return to the Mystical: Ludwig Wittgenstein, Teresa of Avila and the Christian Mystical Tradition (Continuum 2011).