What were the beatings like in the concentration camp? What does Frankl argue was the worst part of these?

Beatings happened often. Frankl writes that they occurred "at the slightest provocation, sometimes for no reason at all." Frankl notes that the worst part of these was "not the physical pain which hurts the most," but "it is the mental agony caused by the injustice, the unreasonableness of it all," or stated differently, "the insult which they imply."