“The essence of training is to allow error without consequence.”

“The selective voluntary blindness of human beings allows them to ignore the moral consequences of their choices. It has been one of the species' most valuable traits, in terms of the survival of any particular human community.”

“I had no idea we planned to be so ruthless.""It was not publicized or even discussed with the political arm of the colonization program. Ruthlessness was necessary but wins no votes.""But this is not our world, to treat however we want!""Visiting here as students of an alien evolutionary tradition would not be either cost-effective or, ultimately, successful. We would inevitably contaminate Garden, or worse yet, become contaminated and bring potentially deadly Gardenian life forms back to Earth. The three continental preserves will be sufficient to allow biologists to study alien life at some point in the future. And if you really thought we would colonize this world without making it 'ours', you'd be far too naive to command this expedition.""I...didn't realize...""You didn't think about it at all," said the expendable. "The selective voluntary blindness of human beings allows them to ignore the moral consequences of their choices. It has been one of the species' most valuable traits, in terms of the survival of any particular human community.""And you aren't morally blind?""We see the moral ironies very clearly. We simply don't care.”

“Sometimes, what's right is not peaceful or passive. What matters is that you do not hide from the consequences. You bear what must be borne.”

“Life is full of grief, to exactly the degree we allow ourselves to love other people.”

“Valentine went back to class without answering. That night Demosthenes published a scathing denunciation of the population limitation laws. People should be allowed to have as many children as they like, and the surplus population should be sent to other worlds, to spread mankind so far across the galaxy that no danger, no invasion could ever threaten the human race with annihilation. "The most noble title any child can have," Demosthenes wrote, "is Third.”

“The world is full of grief - to the exact degree we allow ourselves to love other people. (Mazer Rackham)”