I had zombie dreams last night. I think it was becasue I ate a sandwich and a bunch of Quaker oat squares right before I went to bed.
"I am not a happy man, Ender. Humanity does not ask us to be happy. It merely asks us to be brilliant on its behalf. Survival first, then happiness as we can manage it."
Rackham is telling ender that although he was manipulated and taken advantage of, it was what needed to be done. Rackham's philosophy focuses on the bigger picture. he is telling ender that he is just a small part of a whole, and sometimes, the whole must be put before individuality and personal preference. this means that sometimes, in order to live a better life, happiness must be sacrificed.