The famous quote made by William Shakespeare "Neither a borrow nor a lender be" means don't borrow and don't lend. Polonius goes on to explain that if you lend money to a friend, you will lose both...
Polonius is full of good advice. He tells his son Laertes never to lend money or borrow it. If you lend it, you often won't get it back. If you borrow it, it makes you less careful in how you manage...