My Dear Cassandra ,—You must read your letters over five times in future before you send them, and then, perhaps, you may find them as entertaining as I do.
— from The Letters of Jane Austen Selected from the compilation of her great nephew, Edward, Lord Bradbourne by Jane Austen

If we are to discuss this matter with any hope of arriving at a rational conclusion, you must rid yourself of the flattering deception that you have been doing no wrong.
— from Harper's New Monthly Magazine, Vol. 3, No. 15, August, 1851 by Various

Stop biting your nails, chewing your moustaches, rolling your tongue in your mouth or any other unnecessary movement such as may have become "second nature" with you while studying, reading or writing.
— from The Doctrine and Practice of Yoga Including the Practices and Exercises of Concentration, both Objective and Subjective, and Active and Passive Mentation, an Elucidation of Maya, Guru Worship, and the Worship of the Terrible, also the Mystery of Will-Force by Mukerji, A. P., swámi

"If you will give us your company you must reconcile yourself to our merriment.
— from King Eric and the Outlaws, Vol. 1 or, the Throne, the Church, and the People in the Thirteenth Century. by Bernhard Severin Ingemann

"Come, you must reserve your thanks for the excellent lady you term your protecting angel.
— from The Mysteries of Paris, Volume 2 of 6 by Eugène Sue

Gabrielle, on the contrary, you must resume your strength to continue the contest.”
— from The Catholic World, Vol. 15, Nos. 85-90, April 1872-September 1872 A Monthly Magazine by Various

If now you have changed your mind——" "Regarding you my mind will never change.
— from The Perfume of Eros: A Fifth Avenue Incident by Edgar Saltus

In the one case you must remain yourself, in the other you, being nonexistent, cannot suffer chance or change.
— from Red Rowans by Flora Annie Webster Steel

You must not say to yourselves, 'Perhaps he did not commit the act, after all,' because no one saw him commit it; but if the chain of evidence is clear and convincing, you must remember your oaths, your duty to your country and your God; and, having consulted only conscience, express by your verdict the conviction of your minds, as you will answer for it at the dreadful day of judgment."
— from A Whim, and Its Consequences Collection of British Authors Vol. CXIV by G. P. R. (George Payne Rainsford) James

“Of course you must run your own risk.
— from Living Too Fast; Or, The Confessions of a Bank Officer by Oliver Optic

For his sake I am willing to make some allowance for you—on one condition you may retain your commission, and, I trust, retrieve this well-nigh fatal mistake in the future.
— from False Evidence by E. Phillips (Edward Phillips) Oppenheim