revealed before about the source of his spiritual survival 
(ROOT (S (VP (VBN revealed) (PP (IN before)) (PP (IN about) (NP (NP (DT the) (NN source)) (PP (IN of) (NP (PRP$ his) (JJ spiritual) (NN survival))))))))
(ROOT (S (VP (VBN ) (PP (IN )) (PP (IN ) (NP (NP (DT ) (NN )) (PP (IN ) (NP (PRP$ ) (JJ ) (NN ))))))))