Zen Master Seung Sahn: It's easy to talk about "When you're doing something, just do it," but action is very difficult. Sitting: thinking, thinking, thinking. Chanting: also thinking, thinking. Bowing time: not so much, but some thinking, thinking, checking, checking mind appear. Then you have a problem. But don't hold. Thinking is OK. Checking is OK. Only holding is a problem. Don't hold. Feeling coming, going, OK. Don't hold. If your mind is not holding anything, it is clear like space. Clear like space means that sometimes clouds come, sometimes rain or lightning or airplane comes, or even a missile blows up, BOOM! World explodes, but the air is never broken. This space is never broken. Yeah, other things are broken but this space is never changing. Even if a nuclear bomb explodes, it doesn't matter. Space is space. That mind is very important.