The key to a commitment to pro bono, Lardent says, is a firm's stance on whether pro bono work counts internally as billable hours. 
They did not care if they got paid as long as they were able to make a difference.
mnli hypothesis: They did not care if they got paid as long as they were able to make a difference. premise: The key to a commitment to pro bono, Lardent says, is a firm's stance on whether pro bono work counts internally as billable hours. 