The best and soundest of his time hath been but rash. Then must we look from his age to receive not alone the imperfections of long-engrafted condition, but therewithal the unruly waywardness that infirm and choleric years bring with them.

– William Shakespeare

King Lear, Act 1, Scene 1. Goneril agrees with sister Regan that Lear has always been rash and quick-tempered, but with age and senility she warns that they could expect his unpredictable bad temper to worsen. This foreshadows Lear’s eventual descent into insanity.