“And here, according to Trout, was the reason human beings could not reject ideas because they were bad: "Ideas on Earth were badges of friendship or enmity. Their content did not matter. Friends agreed with friends, in order to express friendliness. Enemies disagreed with enemies, in order to express enmity. "The ideas Earthlings held didn't matter for hundreds of thousands of years, since they couldn't do much about them anyway. Ideas might as well be badges as anything."They even had a saying about the futility of ideas: 'If wishes were horses, beggars would ride.' "And then Earthlings discovered tools. Suddenly agreeing with friends could be a form of suicide or worse. But agreements went on, not for the sake of common sense or decency or self-preservation, but for friendliness."Earthlings went on being friendly, when they should have been thinking instead. And even when they built computers to do some thinking for them, they designed them not so much for wisdom as for friendliness. So they were doomed. Homicidal beggars could ride.”

“Ideas on earth were badges of friendship or enmity. Their content did not matter. Friends agreed with friends, in order to express friendliness. Enemies disagreed with enemies, in order to express enimity.”

“Earthlings went on being friendly, when they should have been thinking instead.”

“The women all had big minds because they were big animals, but they didn't use them for this reason: unusual ideas could make enemies and the women, if they were going to achieve any sort of comfort and safety, needed all the friends they could get. So, in the interest of survival they trained themselves to be agreeing machines. All their minds had to do was to discover what other people were thinking and then they thought it too.”

“The difference between a friend and an enemy is friendliness.”

“Lionel Merble was a machine. Tralfamadorians, of course, say that every creature and plant in the Universe is a machine. It amuses them that so many Earthlings are offended by the idea of being machines.”