Who said when guns are outlawed only outlaws will have guns?

In modern day, it was taken from the NRA bumper sticker, in a campaign started several years ago.

But the origins lie in the philosophers of any of history's republics, and perhaps was best explained by Italy's Cesare Beccaria who said the following in the 1760's:

"The laws that forbid the carrying of arms..." "...disarm those only who are neither inclined nor determined to commit crimes. Can it be supposed that those who have the courage to violate the most sacred laws of humanity, the most important of the code, will respect the less important and arbitrary ones, which can be violated with ease and impunity, and which, if strictly obeyed, would put an end to personal liberty -- so dear to men," "...and subject innocent persons to all the vexations that the guilty alone ought to suffer? Such laws make things worse for the assaulted and better for the assailants; they serve rather to encourage than to prevent homicides, for an unarmed man may be attacked with greater confidence than an armed man."

**This has been translated and paraphrased multiple times, but certainly fits the bill.