Families such as the Imagawa were influential in the development of warrior ethics and were widely quoted by other lords during their lifetime. The writings of Imagawa Sadayo were highly respected and sought out by Tokugawa Ieyasu as the source of Japanese Feudal Law. These writings were a required study among traditional Japanese until World War II.

In his book "Japanese Culture" (2000), historian H. Paul Varley notes the description of Japan given by Jesuit leader St. Francis Xavier (1506–1552): "There is no nation in the world which fears death less." Xavier further describes the honor and manners of the people: "I fancy that there are no people in the world more punctilious about their honour than the Japanese, for they will not put up with a single insult or even a word spoken in anger." Xavier spent the years 1549-1551 converting Japanese to Christianity. He also observed: "The Japanese are much braver and more warlike than the people of China, Korea, Ternate and all of the other nations around the Philippines."

In December 1547, Francis was in Malacca (Malaysia) waiting to return to Goa (India) when he met a low-ranked samurai named Anjiro (possibly spelled "Yajiro"). Anjiro was not a nobleman or an intellectual, but he impressed Xavier because he took careful notes of everything he said in church. Xavier made the decision to go to Japan in part because this low-ranking samurai convinced him in Portuguese that the Japanese people were highly educated and eager to learn. They were hard workers and respectful of authority. In their laws and customs they were led by reason, and, should the Christian faith convince them of its truth, they would accept it en masse.[6]

By the 12th century, upper-class samurai were highly literate due to the general introduction of Confucianism from China during the 7th to 9th centuries, and in response to their perceived need to deal with the imperial court, who had a monopoly on culture and literacy for most of the Heian period. As a result they aspired to the more cultured abilities of the nobility.[7]

Examples such as Taira Tadanori (a samurai who appears in the Heike Monogatari) demonstrate that warriors idealized the arts and aspired to become skilled in them.

Tadanori was famous for his skill with the pen and the sword or the "bun and the bu", the harmony of fighting and learning. Samurai were expected to be cultured and literate, and admired the ancient saying "Bun Bu Ryo Do" (文武両道, lit., literary arts, military arts, both ways) or "The pen and the sword in accord." By the time of the Edo period, Japan had a higher literacy rate than Europe.[citation needed]