I keep my mind on it. That's the whole trick, in so far as stage experience goes; keeping right there every second. If I think of anything else for a flash, I'm gone, done for. But at the same time, one can take things in — with another part of your brain, maybe. It's different from what you get in study, more practical and conclusive. There are some things you learn best in calm, and some in storm. You learn the delivery of a part only before an audience.
Thea, in Part VI, Ch. 7 - The Song of the Lark (1915)