The origin of Sumitomo’s Business Philosophy can be traced back to The Aphorisms of Monjuin (Monjuin Shiigaki), an instructional missive that Masatomo Sumitomo, the founder of the Sumitomo family business, bequeathed to posterity some 350 years ago.
In his later years, Masatomo resided in a hermitage, leading a life that sought to combine both the spiritual and the worldly aspects of existence. In letters and other writings, he offered admonitions and instructions to his family and followers on how to do business and how to lead a worthy life. The Aphorisms of Monjuin, consisting of five articles, plainly communicates proper business values and practices. These teachings have been handed down from generation to generation as precepts of the Sumitomo family.
The business posture advocated in these teachings of according prime importance to integrity and avoiding pursuit of immoral business is the essence of Sumitomo's Business Philosophy.