“Being tolerant does not mean that I share another one’s belief. But it does mean that I acknowledge another one’s right to believe, and obey, his own conscience.”

I like it, I'll go with that.

Nazi camp inmate, was that his only qualification or is that the only qualification that counts?

For whatever it's worth: The wisdom and ultimate peace suffusing these words is universal, with no attendant celebrity, religiosity or academic standing required by whomever may speak them or something similar. That said, Viktor Frankl originated logotherapy, a type of existential analysis known as the "Third Viennese School of Psychotherapy."