Keep yourselves up betimes, my brethren, learn to keep yourselves up!
— from Thus Spake Zarathustra: A Book for All and None by Friedrich Wilhelm Nietzsche

I know you understand.
— from Anne of the Island by L. M. (Lucy Maud) Montgomery

If I doubt that you are worthy of my confidence, I keep you uninformed of all my secrets just as if you were un worthy of the same.
— from The Will to Believe, and Other Essays in Popular Philosophy by William James

Kotake, Y. Ueber den Abbau des Coffeïns durch den Auszug aus der Rinderleber.
— from All About Coffee by William H. (William Harrison) Ukers

“Very sorry to knock you up, Watson,” said he, “but it’s the common lot this morning.
— from Adventures of Sherlock Holmes Illustrated by Arthur Conan Doyle

‘What! you a friend to the Bradys, and knowing your uncle to be distressed for money, try and break off a match which will bring fifteen hundred a year into the family?
— from Barry Lyndon by William Makepeace Thackeray

"You are knocking yourself up, old man," I remarked.
— from The Sign of the Four by Arthur Conan Doyle

It is he who threw down this rock to kill you under it, and Eve with you, and thus to prevent you from living on the earth.
— from The First Book of Adam and Eve by Rutherford Hayes Platt

“Oh, no, certainly not; I did not know you under your married name; but I am so happy to renew an acquaintance which at one time had such charming promise.”
— from The Romance of Lust: A classic Victorian erotic novel by Anonymous

I knew you used to go with Madge, but since—— Oh, hang it all, I can’t explain—I’m Ruth’s brother, you know.
— from A Quarter-Back's Pluck: A Story of College Football by Lester Chadwick

he answered with a laugh; "but I won't have you knocking yourself up again over this.
— from Captain Desmond, V.C. by Maud Diver

There you shall stay, if hard chunks and solid wood can keep you, until your yellow flesh rots away from your bones.
— from The Old Bell of Independence; Or, Philadelphia in 1776 by Henry C. (Henry Clay) Watson

I cannot be said here either to know your umbrella, or my own, which latter my feeling more completely resembles.
— from The Meaning of Truth by William James

I was rather afraid, you know, that you'd hang about in town all through the summer, and that 'ud be bound to knock you up."
— from Sally Bishop: A Romance by E. Temple (Ernest Temple) Thurston

When I stood on the Promenade at Portland with the kind young Unitarian minister whom I had brought a letter to, and who led me there for a most impressive first view of the ocean, I could not make more of it than there was of Lake Erie; and I have never thought the color of the sea comparable to the tender blue of the lake.
— from Literary Friends and Acquaintance; a Personal Retrospect of American Authorship by William Dean Howells

“Therefore there is all the more need to keep you up to it, to exhort, drive and urge you and so render you bold.
— from Luther, vol. 2 of 6 by Hartmann Grisar

[Aloud] I will knog your urinals about your knave's cogscomb for missing your meetings and appointments. CAIUS.
— from The Merry Wives of Windsor by William Shakespeare