That Quote Is From.... #3

That Shakespearen insult "A fusty nut with no kernel" is from Troilus and Cressida, Act II, Scene 1. Here's a larger context:

  ACHILLES. Your last service was suff'rance; 'twas not voluntary. No
    man is beaten voluntary. Ajax was here the voluntary, and you as
    under an impress.
  THERSITES. E'en so; a great deal of your wit too lies in your
    sinews, or else there be liars. Hector shall have a great catch
    an he knock out either of your brains: 'a were as good crack a
    fusty nut with no kernel.
  ACHILLES. What, with me too, Thersites?
  THERSITES. There's Ulysses and old Nestor-whose wit was mouldy ere
    your grandsires had nails on their toes-yoke you like draught
    oxen, and make you plough up the wars.