Definition of the words insanity , incapacity .

Furiosus stipulare non potest nec aliquid negotium agere, qui non intelligit quid agit. An insane person who knows not what he is doing, cannot contract nor transact any business.

Furiosi nulla voluntas est. A madman has no will.

https://www.hooktube.com/watch?v=cVbTdBPqDwg