Answer:
The answers are to be found in the word concerning
Explanation:
Here the word concerning is used as a preposition, meaning something like: on the subject of, or in connection with.
So Clara has not given up on the power/justness of truth; she does show that she doesn´t agree at all with Carwin´s idea of truth. I don´t believe that Brown makes a statement on Truth, he rather pictures the disagreement on the topic of truth between the two.