Someone in need of money asked the great sage The Taz for a loan. The Taz did not have any cash on hand, so he gave the man a valuable household item to give to a pawnbroker. The pawnbroker would give the man the money, and The Taz would later redeem the article.
When The Taz went to the pawnbroker, he found out that the man had taken twice as much money as they had agreed upon.
Nevertheless, The Taz remained calm and said: "It was fortunate that I didn't have any money available when the person asked for the loan. He evidently needed more money than he asked me for, but was probably too shy to ask for a larger loan. My giving him an article to pawn enabled him to receive the money he really needed without having to approach a second person for another loan."
(Ohr Yeshorim, p.217; Rabbi Pliskin's Gateway to Happiness, p.186)