Your sermons: all foam and no beer?

I once heard a talk criticised for being ‘all foam, no beer.’

Obviously, no one wants a pint that is 75 per cent foam and 25 per cent actual beer. And so, a talk that’s all foam and no beer is considered lacking in substance, body, and nourishing goodness.

For those providing the critique, the ‘foam’ represented illustrative material, all that light and worthless froth. The beer represented the solid, weighty, doctrinal content of exegesis and exposition (or lack thereof, in this case).