The correct answer to this open question is the following.
You forgot to include the quote. Without it, we do not know what quote you are referring to. However, there is a famous Crazy Horse quote that says: "My lands are where my dead are buried." If this is the quote of your question, we can add the following.
The message that Crazy Horse is conveying in the quote is that those lands belonged to his people. By no means the whites had the right to take it. Those lands belonged to his ancestors and were inherited to the next generations. Native American Indians were already there so many years before whites arrived. So those lands were Indian lands.