If a person do not possesses daily practice according to a certain scripture, no correct faith, correct vow and correct practices, it is difficult for him to enter into the particular monkish sorts of frame of mind when investigating a topic. It is said that there have been many people becoming nervous after investigating a topic, which is because that he or she has not enough virtuous roots, no daily practice cleaving to a certain scripture. (From Words of Chan by Shi Yongxin)