Authors:

....for friendships that are acquired by a price and not by greatness and nobility of character are purchased but are not owned, and at the proper moment they cannot be spent.

Niccolo Machiavelli (1979). “The Portable Machiavelli”, p.93, Penguin
....for friendships that are acquired by a price and not by greatness and nobility of character are purchased but are not owned, and at the proper moment they cannot be spent.