If in this Glass of Humours you do find
The Passions or diseases of your mind,
Here without pain, you safely may endure,
Though not to suffer, yet to read your cure.
But if you nothing meet you can apply,
Then ere you need, you have a remedy.
And I do wish you never may have cause
To be adjudg'd by these fantastick Laws;
But that this books example may be known,
By others Melancholy, not your own.

Henry King

http://www.poemhunter.com/poem/to-the-same-lady-upon-mr-burtons-melancholy/