During his study of Buddhism, Yoshimoto followed the ascetic practice of Mishirabe - an arduous form of meditation and self reflection which included physical privations including fasting, avoidance of sleep, and intense introspection sessions.[2] Wanting to make this practice more accessible to everyone, Yoshimoto developed Naikan as a relatively easier method allowing anyone to gain the benefits of self reflection without the physical discomforts required by Mishirabe.[2]
At its core, Naikan is a method of structured self reflection based around three basic questions -
What have I received from____?
What have I given to_____?
What troubles and difficulties have I caused____?[1]
There are currently more than 30 Naikan centres in Japan, offering mental health counselling, addiction treatment, and the rehabilitation of prisoners.[1]