“There was one thing my murderer didn't understand; he didn't understand how much a father could love his child.”

“She didn't know how much she'd been hoping that he still loved her, until she felt how much it hurt to realize he didn't.”

“Only one man ever understood me, and he didn't understand me.”

“I didn't add any new elements [to the modern synthetic theory] to speak of. I just modified things so that people could understand how things were in the plant world.”

“Randal said it would be tough to do in sed. He didn't say he didn't understand sed. Randal understands sed quite well. Which is why he uses Perl.”

“How long could you love a woman who didn't love you, Cecil?
A woman who didn't love me? Oh, all my life!”

“At night, when I couldn't sleep, I'd sometimes carry on silent arguments with those people. I'd be screaming at them, telling them how much I detested their blind, thoughtless, automatic acquiescence to it all, their simpleminded patriotism, their prideful ignorance, their love-it-or-leave it platitudes, how they were sending me off to fight a war they didn't understand and didn't want to understand.”

“Myrnin, drive carefully. Understand?"
"Of course."
He didn't.”

“He knew what 'I love you' meant, and he knew it was good, but he didn't understand why it was an explanation for anything.”

“I liked things better when I didn't understand them.”