Thinking is the hardest work there is, which is probably the reason why so few engage in it.

Nobody can think straight who does not work. Idleness warps the mind.

Whether you think you can, or you think you can't--you're right.

Coming together is a beginning. Keeping together is progress. Working together is success.

Whether you think that you can, or that you can't, you are usually right.

With a musical, you kind of have to do a mind-meld with the book-writer, the lyricist, the composer, the director - sometimes the producer. I think that's a reason why musicals are the hardest form.