Kong-an also means cut off all thinking. Just do it. You shouldn't want to find an answer. Now in China, Pure Land practice is very popular. That is OK but not true Zen.
Nobody understands that.
Yes, this style of teaching has been used for such a long time that the true meaning has been lost. Today, nobody understands. During the Tang and Sung dynasties everyone understood the correct teaching. Not thinking words. If you keep this question, all thinking disappears.