Our existence is beyond our explanation, whether we believe in God or we have religion or we're atheist. Our existence is beyond our understanding. No one has an answer.
I have a punishing workout regimen. Every day I do 3 minutes on a treadmill, then I lie down, drink a glass of vodka and smoke a cigarette.
What I do is just go over and over and over my lines and learn the script so well that I can just be easy and relaxed. That's the way I always work.
If I spent all my time criticising myself, I wouldn't be able to function. There are actors who theorise till the cows come home. I haven't the patience for them. It's maybe shallow, but that's why I'll never be part of the acting set.