According to the Kabbalah, when a righteous man leaves a place, an impression, a reshimu (רשימו) stays in that place (I believe everyone leaves an impression in a place where they are when they leave).  This reshimu is the holiness remaining in the place after he left ( Read more... )

The Arizal (Rabbi Isaac Luria) taught that there were three phases in the creation.  First, there was the Endless Light (Ain Soph Ohr).  Then G-d divided the light from the darkness and created a void without light.  Then G-d sent a ray of light (kav) into the darkness ( Read more... )