It's attributed (the definition) to both Einstein and Franklin

Of course, insanity is a legal term. </font><blockquote><div id="quote"><font class="small">Quote:</font>
DEFENSE, INSANITY - A criminal defense asserting that at the time of the commission of the acts constituting the offense, the defendant, as a result of a severe mental disease or defect, was unable to appreciate the nature and quality or the wrongfulness of his acts. Mental disease or defect does not otherwise constitute a defense. U.S.C. 18

A person is insane, and is not responsible for criminal conduct if, at the time of such conduct, as a result of a severe mental disease or defect, he was unable to appreciate the nature and quality or the wrongfulness of his acts. This is because willfull (sic) intent is an essential part of most offenses; and a person who is insane is not capable of forming such intent. Mental disease or defect does not otherwise constitute a defense; the person has the burden of proving the defense of insanity by clear and convincing evidence.

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Makes one wonder how anyone can handle a mental health support website