Ender's Reasoning

One of the most important lines of chapter 6 is "Human beings are free except when humanity needs them. Maybe humanity needs you. To do something. Maybe humanity needs me—to find out what you're good for. We might both do despicable things, Ender, but if humankind survives, then we were good tools." This quote is very important to the chapter because he is telling the reasons behind everything they are doing in the book. I consider that a very important part in chapter 6. Ender believes that people are more than just pawns on a chess board. He strongly believes that everyone and everything has a purpose even if it is small or big. What do you think this quote means? If you are reading or have read this book do you think something else?