I'm a member of BAFTA, so I vote in all the films that come up for the Academy Awards.
I normally go through every single line as part of my warm-up before a show. When I'm working on a film or TV programme, there often isn't a rehearsal, so I tend to learn my lines much later. They are often shorter, too, so they're essentially just there.
I gave up tennis to study, but not before it had shown me how to focus and concentrate. It taught me self-discipline: I was playing four or five hours a day and doing five-mile runs. When I stopped, my energy had to be channelled into something else.
The important thing with memorising a part is not to force it. Sometimes when you're rehearsing, you'll think it's not going in, but it is. On stage, you have to trust that the lines are there, because they are. The real challenge is to relax.
I can guarantee this to you: every single actor has had a dream of walking on stage on press night and realising that they don't know their lines.
In modern life, we hide behind ourselves. In Shakespeare, there's nowhere left to hide. It's life, larger than life, and every actor has to raise their game to get there.