A Defensless Preacher?

Here is another Spurgeon quote I found that might find it's sharp iron peircing through many preachers hum drum regular life behind the pulpit.

"No sort of defense is needed for preaching out of doors; but it would need very potent arguments to prove that a man had done his duty who has never preached beyond the walls of his meeting-house. A defense is required rather for services within buildings than for worship outside of them."

I sure do love to read Spurgeon.