Quotes about know-how
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Source: Devil in Winter

Variant: The rain to the wind said,
You push and I'll pelt.'
They so smote the garden bed
That the flowers actually knelt,
And lay lodged--though not dead.
I know how the flowers felt.
Source: The Poetry of Robert Frost
Source: Duchess By Night

Google this: Jean Vanier and what it means to be human http://www.huffingtonpost.com/david-briggs/google-this-jean-vanier-a_b_7484702.html Huffington Post, 02/06/2015
From interviews and talks
Source: Community And Growth

“Courage is being the only only one who knows how terrified you are.”
Source: Red Rabbit

“I don't know how it is… but you seem to think me something wonderful, and indeed, I am not.”
Source: The Masqueraders

“He wanted what he didn’t know and he didn’t know how to get what he wanted.’ (Acheron)”
Source: Acheron

“Sometimes a man doesn't know how badly he's hurt until someone else probes the wound.”
Source: Assassin's Quest

“A Warrior of Light never resorts to trickery, but he knows how to distract his opponent.”
Source: Warrior of the Light
“One of the secrets of a successful life is to know how to be a little profitably crazy.”
Source: To Love and Be Wise

“She didn't even know how dangerous the truth could be, all the tiny, shattering seeds it carried.”
Source: The Mermaid Chair
“Sometimes the only way to know how far you'd come was to return to where you once had been.”
Source: Lover Unleashed

“If you are always trying to be normal, you will never know how amazing you can be.”

“He who knows best knows how little he knows.”

The Divinisation of Our Activities, p. 66
The Divine Milieu (1960)

“who would dare think that, forever? Some idiot girl who wouldn’t know how things played out.”
Source: Why We Broke Up

“You will never know how sharp a sword is unless it's drawn from its sheath”
“I try to find meaning anywhere I can. It's the only way I know how to validate my existence.”
Source: God-Shaped Hole
Source: Between The Tides

“When the police came, they found my brother asleep on the roof. Nobody knows how he got there.”
Source: The Perks of Being a Wallflower

“Without heroes, we're all plain people, and don't know how far we can go.”
The Natural (1952) p. 154 http://books.google.com/books?id=wCWhegoGUxwC&q=%22Without+heroes+we're+all+plain+people+and+don't+know+how+far+we+can+go%22&pg=PA148#v=onepage

“I am, indeed, a king, because I know how to rule myself.”
Source: The Curious Case of Benjamin Button Screenplay

“Please, I'm a transgender former boy-bander. You think I don't know how to defend myself?”
Source: Beauty Queens
Source: Don't Sweat the Small Stuff ... and it's all small stuff: Simple Ways to Keep the Little Things from Taking Over Your Life
“Suffering is humbling. It pays to know how to get your butt kicked.”
Source: Born to Run: A Hidden Tribe, Superathletes, and the Greatest Race the World Has Never Seen

“You know how both life and porno movies end. The only difference is life starts with the orgasm.”
“Also I wanted to be able to love
And we all know how that one goes, don't we?
Slowly”
Source: New and Selected Poems, Vol. 1

p. 219 http://www.gutenberg.org/files/2162/2162-h/2162-h.htm#emancipation
The Tragedy of Woman's Emancipation (1906)

Attributed in The Rebirth of a Nation : With a Bill of Rights for America's Third Century (1978) by Robert S. Minor, p. 10; this is a paraphrase of a statement by his father John Adams in a letter to his mother Abigail Adams (27 April 1777): "Posterity! you will never know how much it cost the present generation to preserve your freedom! I hope you will make a good use of it. If you do not, I shall repent in Heaven that I ever took half the pains to preserve it".
Misattributed
“Anyone who knows how scary it is to be alone, can't help loving others." ~Rin Sohma”
Source: Fruits Basket, Vol. 14
Source: Magic Slays

Source: 2010s, Why Marx Was Right (2011), Chapter 1, p. 6
Source: The Tycoon's Rebel Bride

Source: Today I Will: A Year of Quotes, Notes, and Promises to Myself

“It is a happy talent to know how to play.”

“The greatest thing in the world is to know how to belong to oneself.”
La plus grande chose du monde, c'est de savoir être à soi.
Book I, Ch. 39
Essais (1595), Book I
Source: The Complete Essays
“I think I want to be in love with you but I don't know how.”
Source: The Magic Toyshop