So, when you practice the Tao, or the Truth, or the Dharma, the Way, you will encounter ten kinds of samadhic experiences from inside. And then you may mistake these for some ultimate enlightenment. And thus, some of the demons who are correspondent to your state of mind or samadhic experience at that time, they may enter you. They may be around you. And then they will mislead you, make you think that you already attain the complete Tao or the complete enlightenment, but not yet. So, the Buddha warned His monks at that time. This is our ten states of mind.