Ch 17; Variant: All things truly wicked start from innocence.
As quoted by R Z Sheppard in review of The Garden of Eden (1986) TIME (26 May 1986)
A Moveable Feast (1964)

“No, that is the great fallacy: the wisdom of old men. They do not grow wise. They grow careful.”

Ernest Hemingway book A Farewell to Arms

Source: A Farewell to Arms (1929)

“Isn't it pretty to think so.”

Ernest Hemingway book The Sun Also Rises

Source: The Sun Also Rises

“we would be together and have our books and at night be warm in bed together with the windows open and the stars bright.”

Ernest Hemingway book A Moveable Feast

Variant: Where we would be together and have our books and at night be warm in bed together with the windows open and the stars bright. That was where we could go.
Source: A Moveable Feast

“It is awfully easy to be hard-boiled about everything in the daytime, but at night it is another thing.”

Ernest Hemingway book The Sun Also Rises

Source: The Sun Also Rises

“They wrote in the old days that it is sweet and fitting to die for ones country. But in modern war there is nothing sweet nor fitting in your dying. You will die like a dog for no good reason.”

Ernest Hemingway

Dulce et decorum est pro patria mori. Sweet and glorious it is to die for our country. ~ Horace in Odes, Book 3, Ode 2, Line 13, as translated in The Works of Horace by J. C. Elgood
Notes on the Next War (1935)

“Worry a little bit every day and in a lifetime you will lose a couple of years. If something is wrong, fix it if you can. But train yourself not to worry: Worry never fixes anything.”

Ernest Hemingway

“Madame, all stories, if continued far enough, end in death, and he is no true-story teller who would keep that from you.”

Ernest Hemingway book Death in the Afternoon

Source: Death in the Afternoon (1932), Ch. 11

“We ate well and cheaply and drank well and cheaply and slept well and warm together and loved each other.”

Ernest Hemingway book A Moveable Feast

Source: A Moveable Feast

“It's none of their business that you have to learn how to write. Let them think you were born that way.”

Ernest Hemingway

On the loss of a suitcase containing work from his first two years as a writer, as quoted in With Hemingway (1984) by Arnold Samuelson

“Let him think I am more man than I am and I will be so.”