That man is as deep as the ocean, he really is.
And surprisingly shy and humble, it seems. When one has the looks and the talent, why hide it under a bushel? But he does, and the light still shines. 
For me, that's the reason the light shines. I don't like actors who are overconfident. This man is deep, intelligent and a brilliant actor but doesn't let that get into his head (I'm not sure how to say that in English, hope you get my point). I respect him for his honesty and modesty.
"I think that's the problem with a lot of actors in the industry. We all just think we're brilliant, you know? And 98 per cent of us are crap." -Heath Ledger