“Those who fought know a secret about themselves, and it is not very nice.”
… They have experienced secretly and privately their natural human impulse toward sadism and brutality. As I say in this new book of mine, not merely did I learn to kill with a noose of piano wire put around somebody's neck from behind, but I learned to enjoy the prospect of killing that way. It's those things that you learn about yourself that you never forget. You learn that you have much wider dimensions than you had imagined before you had to fight a war. That's salutary. It's well to know exactly who you are so you can conduct the rest of your life properly.
Humanities interview (1996)
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Paul Fussell 15
Recipient of the Purple Heart medal 1924–2012Related quotes

“I want to be with those who know secret things or else alone.”
“Secrets have a way of making themselves felt, even before you know there's a secret.”
Source: Once Upon a Marigold
“A picture is a secret about a secret, the more it tells you the less you know.”
Source: Estrin, James, Diane Arbus, 1923-1971, https://www.nytimes.com/interactive/2018/obituaries/overlooked-diane-arbus.html, 6 November 2018, The New York Times, 8 March 2018]
Diane Arbus: Revelations. New York: Random House, 2003. ISBN 0-375-50620-9.
Ault, Alicia, A Window into the World of Diane Arbus: Photographs from the portfolio, "A box of 10," reveal photographer's secrets, https://www.smithsonianmag.com/smithsonian-institution/window-world-diane-arbus-180968861/, 13 November 2018, Smithsonian, 24 April 2018

“There are no secrets except the secrets that keep themselves.”
Confucius, in Pt. III : The Thing Happens
1920s, Back to Methuselah (1921)

But is it "hostile," really, to take a look at the ferocity of the emotion they call "hostility"?
Paris Review Interview (1986)

“He who would know the secret of both worlds,
Will find the secret of them both, is Love.”
"Intoxicated by the Wine of Love" as translated by Margaret Smith from "The Jawhar Al-Dhat"

O Taste and See : New Poems (1964), The Secret
Source: Poems, 1960-1967