Jiriki and Mushi-dokugo

Jiriki (自力^?, one's own strength^[1]) - here: the Japanese Buddhist term for self power, the ability to achieve liberation or enlightenment (in other words, to reach nirvana) through one's own efforts. Jiriki and tariki (他力 meaning "other power", "outside help") are two terms in Japanese Buddhist schools that classify how one becomes spiritually enlightened.^[2] In Pure Land Buddhism, tariki often refers to the power of Amitābha Buddha.

Mushi-dokugo (無師独悟^?), sometimes called jigo-jishō (自悟自証^?, self-enlightened and self-certified), is a Japanese term used in Zen Buddhism which expresses the phenomenon known as "awakening alone, without a master."^[1][a][2]

It is...

usually considered suspect since the risk of self-delusion or 'fake-Zen' is always high.^[5]

According to William M. Bodiford,

To guarantee that his experience of the truth of Buddhism is genuine, the Zen disciple relies upon his teacher to authenticate and formally acknowledge his enlightenment.^[5]

Dōgen, the founder of the Sōtō school of Japan, acknowledged in his lifetime that such a phenomenon exists