You are not strong enough to travel two hundred and fifty miles at this time of the year.
— from Napoleon's Letters to Josephine, 1796-1812 For the First Time Collected and Translated, with Notes Social, Historical, and Chronological, from Contemporary Sources by Emperor of the French Napoleon I

I am not strong enough to think deeply myself on any subject, but I appeal to professional men, who are.
— from The Woman in White by Wilkie Collins

No rule is so general, which admits not some exception; to this, therefore, which hath been hitherto said, (for I shall otherwise put most men out of commons,) and those inconveniences which proceed from the substance of meats, an intemperate or unseasonable use of them, custom somewhat detracts and qualifies, according to that of Hippocrates, 2 Aphoris.
— from The Anatomy of Melancholy by Robert Burton

Were men as intent upon this as they are on things of lower concernment, there are none so enslaved to the necessities of life who might not find many vacancies that might be husbanded to this advantage of their knowledge.
— from An Essay Concerning Humane Understanding, Volume 2 MDCXC, Based on the 2nd Edition, Books 3 and 4 by John Locke

I am not sure, even, that they are not in the peerage as collaterals; indeed, I am almost sure they are, and that we should find him and everything about him, if we looked."
— from A Country Gentleman and His Family by Mrs. (Margaret) Oliphant

"I fear you are not strong enough to take the sea-voyage at this time of year," she urged.
— from Mal Moulée: A Novel by Ella Wheeler Wilcox

The Infanta Joanna, attended by a numerous suite, embarked towards the end of August at the port of Laredo, on the eastern borders of Asturias, where she bade farewell to her 19 mother, Queen Isabella, who travelled through Spain to take leave of her seventeen-year-old daughter.
— from The First Governess of the Netherlands, Margaret of Austria by Eleanor E. Tremayne

Our hero was no less astonished than was the guide, at such uncontrolled emotion in a youth of a nation so early taught to conceal their feelings; nor were they less surprised at the clearness and purity of accent with which he expressed himself in English.
— from The Prairie-Bird by Murray, Charles Augustus, Sir

As Donne, on the eve of his German tour, leaves a copy of his Biathanatos [Pg 278] in the safe-keeping of Sir Edward Herbert, and the manuscript of his poems in the hands of Sir Robert Ker, so he commits to the appropriate custody of the Countess of Montgomery (“A new Susannah, equal to that old,” Ben Jonson called her) the manuscript of a sermon, which, when she heard him preach it, she had commended.
— from Letters to Severall Persons of Honour by John Donne