We play many roles in our lifetime. The hard part is knowing when to play which role. It’s difficult to know when the curtain is falling and another act is beginning. We don't want to become one of those sad actors, playing a role that has already ended, no longer relevant, out of fashion, reciting lines belonging in another act, another time.
Besides the danger of becoming a washed out hack, there is another danger: Playing our role on stage and then running out into the audience, where we take a seat, then heckle ourselves and play critic.
Since it is God's play, we have to allow him to determine the value of our performance. We are only actors, not knowing when the final curtain falls or the outcome of the play or the resolution of its story lines. There are twists that only the author understands.
The thought that "we are all actors in a play" is an old idea that I've favored because it reminds us that do not have enough information to make heads or tails of too much around us. We are forced to ad lib, to improvise, to guess our way through life.
CS Lewis wrote, “We keep on assuming that we know the play. We do not even know whether we are in Act I or Act V. We do not know who are the major and who the minor characters. The Author knows.”
And then there's Garrison Keillor's quip: "God writes a lot of comedy... the trouble is, he's stuck with so many bad actors who don't know how to play funny."