Strong sitting means not checking your mind and feelings. Everyone sometimes has many thoughts and feelings while sitting. This is correct. Don’t worry. But many people check themselves. “I am no good. What do other people think of me? I am always thinking. How can I cut off all thinking? How do you only go straight? How do you put it all down?” etc. This is being attached to thinking. Thinking itself is not bad or good. Just don’t be attached to thinking. Don’t worry about everything. Thinking is thinking; feeling is feeling. Only go straight—don’t know. That is strong sitting.