The dialogue “And it must follow, as the night the day, thou can’st not then be false to any man.” occurs in Shakespeare’s play, Hamlet, Act 1, Scene 3. This is an advice by Polonius to Laertes. Polonius emphasis on the value of honesty and truth. One should always be honest and true, and follow this motto, like night follows the day. You may use this quote to give a piece of advice to someone.