The 74-year-old filmmaker is still unsure how much he has been impacted by his latest movie - which stars Andrew Garfield and Adam Driver as two missionaries in 17th century Japan who are sent to find an older Jesuit (Liam Neeson) who is rumoured to have renounced his faith - but he is still on a journey with it.
He said: "'Silence' has taken me on a deeper road than my previous films.
"I didn't know how deep it was, and maybe I still don't, quite honestly. I haven't experienced a conversion on the road to Damascus; I'm still on the road. You stop a little here, stop a little there. And eventually, it's only going to one place."
The acclaimed filmmaker also admitted he was on the verge of collapse after making 'The Departed', his 2006 tale of double-crossing police officers, which starred Leonardo DiCaprio and Matt Damon, and felt it would "kill" him if he had to promote the movie as he had had such an "unpleasant" time making the movie.
He recalled told the Sunday Telegraph: "Moral Ground Zero, I call it.
"All the characters killed at the end, basically everyone, and there was no place to go, after that.
"You know, I hardly did any press for that film. I was tired of it. I felt it was maddening.
"I mean, I like the picture, but the process of making it, particularly in the post-production, was highly unpleasant.
"I said, I don't care how much I'm being paid, it'll kill me. I'll die. Very simply."