“O! Let me not be mad, not mad, sweet heaven; keep me in temper; I would not be mad!”

“I will be brief: your noble son is mad:Mad call I it; for, to define true madness,What is't but to be nothing else but mad?”

“Am I in earth, in heaven, or in hell?Sleeping or waking, mad or well-advised?Known unto these, and to myself disguised?I'll say as they say, and persever so,And in this mist at all adventures go.”

“Though this be madness, yet there is method in't.”

“Thou mad mustachio purple-hued maltworms!”

“Madness in great ones must not unwatched go.”

“How many fond fools serve mad jealousy!”