Answer:
He feels strongly about preserving and maintaining them.
Step-by-step explanation:
This is most likely what Chief Joseph feels about his tribe's cultural traditions. In this passage, we learn about the feelings that Chief Joseph has towards his father. He tells us that his father "left a good name on earth" and that he "advised [him] well for [his] people." This indicates that Chief Joseph appreciates his father's advise, and that he most likely values the knowledge of his elders. Therefore, we can assume that Chief Joseph feels strongly about protecting his tribe's culture and traditions.