I am paraphrasing but it would go as:

Show a coin to the girl/ guy you are trying to talk to, "here: you can either have this coin, OR I can give you the most valuable advice you will ever hear."

Hopefully as planned the person will opt for the advice to which you will reply.

"Always take the money."

P.S: If actually interested for the book series I highly recommend them starting from the trilogy of the Broken Empire series (first book is prince of thorns) followed by the Red Queens War trilogy.

Great, great novels.