In his early writings (between 1913 and 1915) he introduced the work of Søren Kierkegaard to Japan, as well as working on Friedrich Nietzsche, but in 1918 he turned against this earlier position, criticizing Western philosophical individualism, and attacking its influence on Japanese thought and life. This led to a study of the roots of Japanese culture, including Japanese Buddhist art, and notably the work of the medieval Zen Buddhist Dōgen. Watsuji was also interested in the famous Japanese writer Natsume Sōseki, whose books were influential during Watsuji's early years.
