in one's right mind
In a healthy mental state; sane and rational. For example, No one in his right mind would ski down this icy slope. This expression is often used in a negative construction, as in the example. The positive sense appears in the New Testament (Mark 5:15), where a deranged man whom Jesus helped is now “sitting, and clothed, and in his right mind.” The antonym out of one's mind, as in You must be out of your mind to swim in that icy stream, is from the same period. [c. 1600] Also see go out of one's mind.
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Example sentences from the Web for in one's right mind
Added to drinking water at concentrations of around one part per million, fluoride ions stick to dental plaque.
In his view, a writer has only one duty: to be present in his books.
Yet this, in the end, is a book from which one emerges sad, gloomy, disenchanted, at least if we agree to take it seriously.
And not just sick in the body but in your mind, because you start obsessing.How Taryn Toomey’s ‘The Class’ Became New York’s Latest Fitness Craze|Lizzie Crocker|January 9, 2015|DAILY BEAST
I disapprove of what you say, but I will defend to the death your right to say it.
Practise gliding in the form of inflection, or slide, from one extreme of pitch to another.Expressive Voice Culture|Jessie Eldridge Southwick
What need to look to right or left when you are swallowing up free mile after mile of dizzying road?The Joyous Adventures of Aristide Pujol|William J. Locke
He alludes to it as one of their evil customs and used by them to produce insensibility.
There was a rumor that Alessandro and his father had both died; but no one knew anything certainly.Ramona|Helen Hunt Jackson
Mrs. Wurzel was quite right; they had been supplied, regardless of cost, from Messrs. Rochet and Stole's well-known establishment.The Pit Town Coronet, Volume I (of 3)|Charles James Wills