It's still entirely unnecessary. I cannot imagine a universe in which it is better for you to quote yourself, than just open your column with that quote as topic sentence. If you were Thomas Friedman or George F Will (both of whom have, I think, done this) it might be different. But you are, of course, not them.
By quoting yourself, what you do is remove focus from the content of the "quote" and redirect it to the fact that you're quoting yourself. So this self-deprecation (incidentally, I do not agree with that characterization; it seems rather the opposite, but whatever) will be catching your reader's attention, as opposed to the content of what you say. And maybe that's fine for you. Personally, I would prefer people to focus on my substance and not on my self-referential messing around.
But what do I know? I'm only a professional writer, and obviously I don't care either way. Just offering some advice.