KING RICHARD: Wrath-kindled gentlemen, be ruled by me.
Let’s purge this choler without letting blood.
This we prescribe, though no physician.
Deep malice makes too deep incision.
Forget, forgive; conclude and be agreed.
Our doctors say this is no month to bleed.

William Shakespeare (1564-1616) English dramatist and poet

Richard II, Act 1, sc. 1, l. 156ff (1.1.56) (1595)
    (Source)

In one of his more lucid (and early) moments of the play, Richard tries to calm the dispute between Bolingbroke and Mowbray.