Zen Master Seong Hyang - Doubt

What is doubt?

Our minds are always trying to label and attach, to make our own identity fields concrete by saying, 'Yeah, that's how I thought it was,' by always trying to make something. When we do that, we're not doubting. It's when you can't understand something that you start to purge yourself - when you are actually stumped. You just sit there and you are stumped. That's doubt.