William Shakespeare coined a number of phrases that we still use today, including (in varying forms) the following from Twelfth Night.

 

“If music be the food of love, play on.”

-Duke Orsino 1.1.1 

 

“My purpose is, indeed a horse of that colour.”

-Maria 2.3.148

 

“I am all the daughters of my father’s house and all the brothers too.”

-Viola 2.4.118

 

“Still you keep o’ th’ windy side of law; good.”

-Fabian 2.4.147 

 

“Be not afraid of greatness. Some are born great, some achieve greatness, and some have greatness thrust upon ’em.”

-Malvolio 2.5.128 

 

“Why, this is very midsummer madness.”

-Olivia 3.4.50