If you can't fail then how can you possible develop as a communicator or as a creator of anything? We are locked into a deeply unhealthy notion that somehow you've got to succeed all the time. An appalling notion. Any painter or writer will tell you that that is no way to proceed. One of the things that will kill off a decent actor, especially a young actor early on and they will never recover from it, is too much success. It's disastrous. You stop being criticized, therefore you stop challenging yourself. You then can't afford to fail because there's too far to fall.