Shakespeare, in addition to being our foremost playwright and greatest writer (ever checked out the sonnets? (Wo)man!) also spent many of his hours trying to come up with that almost agonizingly appropriate phrase for some of his thoughts. After all, what are words but minds at play?
Here below is a long laundry list of the common phrases Shakespeare is credited with inventing (yes, he invented every phrase he wrote, but these are the ones that have lasted into current slang/prose/language):