Preaching from the source

Preacher, do your sermons have a heavenly echo?

You can’t fake it. I suppose we could try. But faked heavenly echoes will surely clang just like when people drop famous names to try to impress us in onversation. Genuine echoes of the glories of heaven’s throne room, of angel voices singing, of intimacy with God; these genuine echoes will not clang. They will usually be faint, even subtle, but resonating with reality if, in fact, they are real.

Of course, there's only one real way for our sermons to have that kind of echo (more here, here, and here).