His appearance was awesome.  He was graced with beauty, but it was wisdom and fear of G-d that lit up his pure face.  When he was was sunk in thoughts of Torah or Mussar, his body seemed to leave its physical state, and his face burned like a torch.  At such times he looked like an angel of G-d and people feared to approach him.  Whoever did not see it with his own eyes cannot imagine it.  He never allowed an artist to draw his face. ~ Sparks of Mussar