Scot McKnight wrote the following about preaching on his blog recently. The topic was plagiarism, but his definition of a sermon made me think. What do you think?

"…What is a sermon? Well, it’s a whole life brought to bear on a text
each week for a single 30 minute or so sermon before a specific
congregation. It shames the preacher not to be who he or she is in the
pulpit, and to pretend to be someone else. It de-localizes the sermon
from the local context. It distorts who the preacher is before the
congregation.

So, the sermon is highly biblical, highly personal, highly local,
and highly temporal: it is the individual preacher engaging God and
Bible and congregation, in that specific location, for that time."