The Merchant of Venice - William Shakespeare - Platanus Publishing

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.