Regarding R. H. Blyth: Blyth's four volume Haiku became especially popular at this time [1950's] because his translations were based on the assumption that the haiku was the poetic expression of Zen. Not surprisingly, his books attracted the attention of the Beat school, most notably writers such as Allen Ginsberg, Gary Snyder and Jack Kerouac, all of whom had a prior interest in Zen.
Reginald Horace BlythZen is mind-less activity, that is, Mind-ful activity, and it may often be advisable to emphasize the mind, and say, Take care of the thoughts and the actions will take care of themselves.
Reginald Horace BlythThink of Zen, of the Void, of Good and Evil and you are bound hand and foot. Think only and entirely and completely of what you are doing at the moment and you are free as a bird.
Reginald Horace Blyth