A lot of times, good improv is when both people, or however many people are in the scene, really have no idea what the next thing you're going to say is. John C. Reilly
You really have no idea whether or not what you're writing is funny. In stand-up and sketch comedy, you know right away and you can make your changes accordingly. Michael Showalter
The way you deal with a scare is the way you deal with a laugh. The timing has to be perfect. When you're dealing with fear or laughter - emotions that happen spontaneously - you hope it's working. But in the moment, you really have no idea. Patrick Wilson
So from an actor's perspective, you really have no idea how you're acting. Ice T
Acknowledging that sometimes, often at very crucial times, you really have no idea where you are going or even where the path lies. A the same time, you can very well know something about where you are now (even if it is knowing that you are lost, confused, enraged or without hope). Jon Kabat-Zinn