It would not do for the samurai to know martial [military] and civil virtues without manifesting [displaying] them. . . . Within his heart he keeps to the ways of peace, but without, he keeps his weapons ready for use. The three classes of the common people make him their teacher and respect him. By following his teachings, they are able to understand what is fundamental and what is secondary. According to this passage, which of these roles must a samurai fulfill? Select all that apply.