Intellectually expounding on Mind or expounding on Nature, is not something that practitioners of Buddhadharma undertake. Having theories about mind or about nature is a profession for those who are apart from the Buddhadharma path. To be bogged down in words and phrases is not speech which leads to liberation (nibbana/nirvana).

Dogen (1200-1253), Dōgen Zenji , was a Japanese Buddhist priest, writer, poet, philosopher, and founder of the Sōtō school of Zen in Japan.