Patience

 Rest, rest, perturbed spirit.
  - William Shakespeare

 Be patient, for the world is broad and wide.
  - William Shakespeare (Romeo and Juliet: Act 3, Scene 3)

Patience, thou young and rose-lipped cherubin
  - William Shakespeare (Othello, Act 4, Scene 2, Page 4)

Though patience be a tired mare, yet she will plod.     
 - William Shakespeare, Henry V, Act II, sc. 1


"Have patience and endure."
 - William Shakespeare (Much Ado About Nothing, IV, i, 253)