“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.”

“He’d grown a mustache since Randall had last seen him. It was hard to understand why: He looked devious enough without it.”

“Te Occidere Possunt Sed Te Edere Non Possunt Nefas Est" ("They can kill you, but the legalities of eating you are quite a bit dicier").”

“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 couldn't understand why God had made the world at all…' I asked my bishop; he didn't know. He said that he didn't think the point arose as far as my practical duties as a parish priest were concerned..”

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

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

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

“That is why man can also never understand himself: For he is himself a timeless act; an act which he performs continuously, and there is no moment in which he might not perform it, as there would have to be to understand himself.”

“More than likely, mother would simply go enigmatic on him, give him one of her inscrutable smiles, and tell him that if he didn't already understand, he never would.”