A responsible warrior is not someone who takes the weight of the world on his shoulders, but someone who has learned to deal with the challenges of the moment.
We too often let the material things serve as indicators that we're doing well, even though something inside us tells us that were not doing our best. That we are avoiding that which is hard, but also necessary. That we are shrinking from rather than rising to the challenges of the age.
You have to find it in the moment, and that's one of the challenges of being an actor - especially a film actor - is that you have to maintain these heightened emotions for long periods of time. There's no trick to it. You just have to do.