In the novel, The Man That Corrupted Hadleyburg, a note is delivered with the sack of gold coins, what does it say?

The note explains that some time ago a financially and morally bankrupt ex-gambler arrived in Hadleyburg, where a citizen gave him twenty dollars and sage advice. Ironically, the stranger amassed a fortune by gambling with those twenty dollars. He now wants to repay his benefactor whose identity can be determined by repeating the words of advice that he spoke so long ago, which are disclosed in a document within a sealed envelope inside the sack. The stranger's note concludes by asking the Richardses to find the man and to conduct their search either privately or publicly.