The Lin-chi way is characterized by dialectical formulae, the three statements (sanku), three mysteries (sangen), and three essentials (sanyō); and the sets of four—four alternatives (shiryōken), four conversations, four types of shouting (shikatsu). The threefold formulae are dense and not explained.
His sayings and some biographical information are gathered in Lin-chi lu (tr. R. F. Sasaki, 1975; see also Rinzairoku), which includes the notable command: ‘If you meet the Buddha, kill the Buddha; if you meet the patriarch, kill the patriarch’, which summarizes the goal of independence from even the highest authority in the achieving of what they alone have the authority to teach.
"Lin-chi I-hsüan." The Concise Oxford Dictionary of World Religions. . Encyclopedia.com. (September 15, 2018). http://www.encyclopedia.com/religion/dictionaries-thesauruses-pictures-and-press-releases/lin-chi-i-hsuan
"Lin-chi I-hsüan." The Concise Oxford Dictionary of World Religions. . Retrieved September 15, 2018 from Encyclopedia.com: http://www.encyclopedia.com/religion/dictionaries-thesauruses-pictures-and-press-releases/lin-chi-i-hsuan