When Scout and Jem ask Atticus why he took the Tom Robinson case in To Kill a Mockingbird, is there a specific quote that he responds with?

Atticus always tried to give his children straight answers to
even the toughest questions, but he didn't divulge the entire truth when Scout first asked him in
Chapter 9. After Cecil Jacobs told Scout that Atticus "defended niggers," she asked her father if
it was true. He told her that all lawyers defended Negroes, but Scout said that Cecil's
accusation made it sound like Atticus was "runnin' a still." Atticus told her that he had many
reasons for taking Tom's case. In addition to Tom being a friend of
Calpurnia's,

I couldn't
hold my head up in town, I couldn't represent this county in the legislature, I couldn't even
tell you or Jem not to do something
again.

When Scout asked if he would
win the case, Atticus told her "No, honey." Later in the chapter, however, Scout overhears
Atticus talking with his brother Jack, and she hears a slightly different
version.

You know, I'd
hoped to get through life without a case of this kind, but John Taylor pointed at me and said
"You're it."

She discovers that it was
Judge Taylor who had directed (asked?) Atticus to take the case.