pushed to their most virtuous limits , 
(ROOT (S (VP (VBD pushed) (PP (IN to) (NP (PRP$ their) (ADJP (RBS most) (JJ virtuous)) (NNS limits)))) (, ,)))
(ROOT (S (VP (VBD ) (PP (IN ) (NP (PRP$ ) (ADJP (RBS ) (JJ )) (NNS )))) (, )))