[gyom]

Nice !

It's not really a paradox, though, because "being a double-edged sword" is a comparison that's being made with regards to the decision of using that particular single-edge sword.

And "being a single-edge sword" here is a technical description of the physical object.

But that quote is something worth writing down somewhere.

[coldtea]

It's written down here: https://www.youtube.com/watch?v=bNtgdspXypo (NSFW)

It's from a Louis C.K. routine.