by his art , which is more than he has ever revealed before about the source of his spiritual survival 
(ROOT (PP (IN by) (NP (NP (PRP$ his) (NN art)) (, ,) (SBAR (WHNP (WDT which)) (S (VP (VBZ is) (NP (NP (JJR more)) (SBAR (IN than) (S (NP (PRP he)) (VP (VBZ has) (ADVP (RB ever)) (VP (VBN revealed) (ADVP (RB before)) (PP (IN about) (NP (NP (DT the) (NN source)) (PP (IN of) (NP (PRP$ his) (JJ spiritual) (NN survival))))))))))))))))
(ROOT (PP (IN ) (NP (NP (PRP$ ) (NN )) (, ) (SBAR (WHNP (WDT )) (S (VP (VBZ ) (NP (NP (JJR )) (SBAR (IN ) (S (NP (PRP )) (VP (VBZ ) (ADVP (RB )) (VP (VBN ) (ADVP (RB )) (PP (IN ) (NP (NP (DT ) (NN )) (PP (IN ) (NP (PRP$ ) (JJ ) (NN ))))))))))))))))