The Catholic theologian Karl Rahner famously said "the Christian of tomorrow will be a mystic, or not a Christian at all." Few people have impacted Christianity in this regard as has Fr. Thomas Keating. A Cistercian monk from St. Benedict's Monastery in Snowmass, Colorado, Fr. Thomas has spent a lifetime in deep Christian practice, and in sharing the fruits of this contemplation with countless others. We were enormously blessed to host a dialogue with Fr. Thomas and Ken Wilber in April of 2006. In today's featured video, Ken presents some of the foundational concepts of Integral spirituality.