The book was first planned with the title "Junsui Keiken to jitsuzai (Pure Experience and Realism)," but the publisher Kodokan opposed to the idea and the title was changed to "Zen no Kenkyu (An Inquiry Into the Good)."
当初は『純粋経験と実在』という題名のもとに構想されていたが、出版社の弘道館が反対したため、この名に改題された。