And none contented: sometimes am I king;
    Then treasons make me wish myself a beggar,
    And so I am: then crushing penury
    Persuades me I was better when a king;
    Then am I king’d again: and by and by
    Think that I am unking’d by Bolingbroke,
    And straight am nothing: but whate’er I be,
    Nor I nor any man that but man is
    With nothing shall be pleased, till he be eased
    With being nothing.
 
Richard 11 Act 5 Scene 5