Definition of insanity: the state of being seriously mentally ill; madness.
Given: Def of Insanity.
NOI is not mad, bro.
Prove: NOI is not insane.
Assume NOI is insane.
Then, NOI is mad.
But this is impossible because it contradicts the given fact that NOI is not mad.
Consequently, our assumption (Assume NOI is insane.) is incorrect.
Therefore, NOI is not insane, because that is the only other option.