“In sooth, I know not why I am so sad:

It wearies me; you say it wearies you;

But how I caught it, found it, or came by it,

What stuff ‘tis made of, whereof it is born, I am to learn;

And such a want-wit sadness makes of me,

That I have much ado to know myself.

–Shakespeare Antonio in “ The Merchant of Venice”