William Shakespeare

William Shakespeare was a prolific playwright who lived in the late 15th and early 16th century. To this day, he is considered one of the greatest literary figures of all time.

In Signed, Sealed, Delivered, a love of Shakespeare's works is part of the O'Toole family tradition and legacy, thus Oliver quotes him often. He is quoted by other characters as well.

Quotes in Signed, Sealed, Delivered
There are more things in heaven and earth, Horatio, than are dreamt of in your philosophy. - Oliver and Shane, the pilot, quoting Hamlet

Read on, Macduff. - Shane, the pilot, parodying "Lay on, Macduff" from Macbeth

And this above all else, to thine own self be true, and it must follow, as the night the day, thou canst not then be false to any man. - Theresa Capodiamonte in Time to Start Livin', Oliver in The Future Me, Oliver and Joe in Truth Be Told, quoting Hamlet

All's well that ends well. - Oliver, Time to Start Livin', quoting All's Well That Ends Well

Some are born great, some achieve greatness, some have greatness thrust upon 'em. - Oliver, Time to Start Livin', quoting Twelfth Night.

O, grief hath changed me since you saw me last. - Oliver, Truth Be Told, quoting The Comedy of Errors