During the time of slavery, a slave was preaching with great power. His master heard of it, and sent for him, and said:

"I understand you are preaching?"  

"Yes," said the slave.

"Well, now," said the master, "I will give you all the time you need, and I want you to prepare a sermon on the Ten Commandments, and to bear down especially on stealing, because there is a great deal of stealing on the plantation."

The slave's countenance fell at once. He said he wouldn't like to do that; there wasn't the warmth in that subject there was in others. 

I have noticed that people are satisfied when you preach about the sins of the patriarchs, but they don't like it when you touch upon the sins of today.