A good, balanced approach to life.
Literally: sentence/missive/literature – military/warrior – two/both – road/way/teaching
Alternately: Both the military and the literary arts. A person who excels at both athletic endeavors (especially, but limited to, martial arts) and scholarship.
Notes: With the changing times, the samurai-inspired world of 武道 (swordsmanship, spear, archery, horse-riding, judo, karate, etc.) has given way to modern sporting practices – including “sport” versions of martial arts, but also game-sports such as soccer. Similarly, the ancient aristocratic arts of letter-writing and poetry have been replaced by a wider array of fields of scholarship: literature, to be sure, but also history, social science, and the physical sciences, among others. These days any physical pursuit and any course of study are probably going to fall within the scope of this phrase.