Can Only Pull the Plug!
Every audience has a different temperature, and that makes a lecture go differently before every audience. The kind of an audience is just as important as the kind of a lecture. A cold audience will make a good lecture poor, while a warm audience will make a poor lecture good.
Let me illustrate:
When I was a boy we had a barrel of sorghum in the woodshed. When mother wanted to make ginger-bread or cookies, she would send me to the woodshed to get a bucket of sorghum from that barrel.
Some warm September day I would pull the plug from the barrel and the sorghum would fairly squirt into my bucket. Later in the fall when it was colder, I would pull the plug but the sorghum would not squirt. It would come out slowly and reluctantly, so that I would have to wait a long while to get a little sorghum. And on some real cold winter day I would pull the plug, but the sorghum would not run at all. It would just look out at me.
I discovered it was the temperature.
I have brought a barrel of sorghum to this audience. The name of the sorghum is "The University of Hard Knocks." I can only pull the plug. I cannot make it run. That will depend upon the temperature of this audience. You can have all you want of it, but to get it to running freely, you will have to warm up.
Did You Bring a Bucket?
No matter how the sorghum runs, you have to have a bucket to get it. How much any one gets out of a lecture depends also upon the size of the bucket he brings to get it in. A big bucket can get filled at a very small stream. A little bucket gets little at the greatest stream. With no bucket you can get nothing at Niagara.
That often explains why one person says a lecture is great, while the next person says he got nothing out of it.