Sound mind

SOUND MIND. That state of a man's mind which is adequate to reason and comes to a judgment upon ordinary subjects, like other rational men.
     2. The law presumes that every person who has acquired his full age is of sound mind, and consequently competent to make contracts and perform all his civil duties; and he who asserts to the contrary must prove the affirmation of his position by explicit evidence, and not by conjectural proof. 2 Hagg Eccl. R. 434; 3 Addams' R. 86; 8 Watts, R. 66; Ray, Med. Jur. Sec. 92; 3 Curt. Eccl. R. 671. Vide Unsound mind.

A Law Dictionary, Adapted to the Constitution and Laws of the United States. By John Bouvier. Published 1856.
References in classic literature ?
He would have given worlds, now, to have that German lad back again with a sound mind.
Crisparkle allows such things their full weight in the preservation of his own sound mind in his own sound body, and that his just spirit is not likely to maintain one set of natural laws for himself and another for me.
And when he hitched his chair a little and dropped his voice to the low note of mystery, it flashed upon me that high professional reputa- tion was not necessarily a guarantee of sound mind.
Where was the wit of the sharp- sighted men of sound mind? Where the dexterity of the lawyers, eager to discover a flaw?
Let it be known to them, as I make it known to you, that being of sound mind, memory, and understanding, I revoke no disposition I have made in her favour.
HOMER: `A sound mind in a manly body, as I believe.'
Women must realise that without sound mind sound body does not exist.
'The constitution said only those who are of sound mind should be made Governor.
Later, the DC had made another statement that the detained suspect was not of sound mind.
class="MsoNormal"Is that MP really of sound mind? Hasn't he lost his mind?
Raila wondered aloud whether the MP was of sound mind.
"As Mayor Duterte celebrates his 74th birthday, we pray the Almighty to continue giving him a sound mind and a healthy body, that he may finish the goals he had set for the betterment of the country and people that he loved so well towards a future of progress and prosperity," he added.