“Why does the brain retain the memory of the hurt from yesterday?”

“Not only we can say that we cannot overload our brain, but we also know that our brain retains everything. The difficulty does not come with the input of information, but in getting it out.”

Ben Carson (1951) 17th and current United States Secretary of Housing and Urban Development; American neurosurgeon

“I was starting to think I was making up memories, just to have answers.
Our brain does that sometimes.
Or at least mine does.”

David Levithan book Every You, Every Me

“How wonderful to be alive," he thought. "But why does it always hurt?”

Borís Pasternak book Doctor Zhivago

“If I'm dead," he murmured. "Why does it hurt so much?”

Rick Riordan book The Lost Hero

“Memory. — It is a mirror, that retains, and retains forever. Nothing is lost in it, nothing is erased. But it can be tarnished. And then one sees nothing in it.”

Joseph Joubert (1754–1824) French moralist and essayist

“Yesterday's just a memory; tomorrow's never what it's supposed to be.”

Bob Dylan (1941) American singer-songwriter, musician, author, and artist

“Study without desire spoils the memory, and it retains nothing that it takes in.”

Leonardo Da Vinci (1452–1519) Italian Renaissance polymath

“Prices have no memory, and yesterday has nothing to do with tomorrow.”

George Goodman (1930–2014) American author and economics commentator

“Having a brain hurt so much sometimes.”

Scott Westerfeld book Specials