Woe is me, that do not even know, what I know not.
— from The Confessions of St. Augustine by Augustine, Saint, Bishop of Hippo

This very peculiar difficulty must be overcome by a natural mental gift of a special kind which is known by the—too restricted—term of Orisinn sense of locality.
— from On War — Volume 1 by Carl von Clausewitz

Thou askest me if I could speak of love, Knowing what I know, and seeing what I have seen.
— from The Works of Edgar Allan Poe, The Raven Edition Table Of Contents And Index Of The Five Volumes by Edgar Allan Poe

He staid with me awhile talking, and telling me his obligations to my Lord Sandwich, which I was glad of; and that the Duke of Buckingham is now chief of all men in this kingdom, which I knew before; and that he do think the Parliament will hardly ever meet again; which is a great many men’s thoughts, and I shall not be sorry for it.
— from The Diary of Samuel Pepys — Complete by Samuel Pepys

'I know what I know,' said Fanny to herself.
— from North and South by Elizabeth Cleghorn Gaskell

"Manners!" cries Slipslop; "I never was thought to want manners nor modesty neither; and for places, there are more places than one; and I know what I know."
— from Joseph Andrews, Vol. 1 by Henry Fielding

Do you wish to know what is known of her?’ ‘Yes,’ said I. She rose with an ill-favoured smile, and taking a few steps towards a wall of holly that was near at hand, dividing the lawn from a kitchen-garden, said, in a louder voice, ‘Come here!’—as if she were calling to some unclean beast.
— from David Copperfield by Charles Dickens

‘Never mind, miss,’ replied the girl; ‘I know what I know; that’s all.’
— from Nicholas Nickleby by Charles Dickens

“Ah, my boy, I know why, I know why,” said Bartle kindly, going up to Adam and raising his hand up to the shoulder that was almost on a level with his own head.
— from Adam Bede by George Eliot

He must never know what I know.
— from Bessie's Fortune: A Novel by Mary Jane Holmes

Mebbe I sha'n't let him know what I know, and mebbe I shall; jest tip him a wink, you know; it depends on circumstances.
— from The Pearl of Orr's Island: A Story of the Coast of Maine by Harriet Beecher Stowe

All the same I know what I know.
— from The Little Old Portrait by Mrs. Molesworth

"Now at that time," he resumed, "I did not know what I know now.
— from The Little Warrior by P. G. (Pelham Grenville) Wodehouse

" "Madame, I know what I know.
— from Ten Years Later by Alexandre Dumas

"He knows what I know.
— from The Golden Hope: A Story of the Time of King Alexander the Great by Robert H. (Robert Higginson) Fuller

Deny it as you will I know what I know, and have not got eyes in my head for nothing.
— from Barbarossa, and Other Tales by Paul Heyse

"If you would know what I know about them things, Shellak, you wouldn't ask me such a question at all.
— from Abe and Mawruss: Being Further Adventures of Potash and Perlmutter by Montague Glass

You couldn't know what I kept secret."
— from Cinderella Jane by Marjorie Benton Cooke

Mind you, if I didn't know what I know I should have to put up with it and hold my tongue, because I am only a servant and no one can blame me for obeying my orders.
— from Hard Pressed by Fred M. (Fred Merrick) White