What is your favorite Ludwig von Mises quotation?

I know that there are many fans of Mises on this forum. I myself have written:

It would be more accurate to consider Menger and Mises forerunners of this author’s Axiomatic School while making Hayek the founder (and Böhm-Bawerk the forerunner) of the Hayekian School. Menger, Mises and this author are the only truly subjectivist economists.

Thus, for this reason and because Mises’ praxeological method and his regression theorem somewhat inspired this author’s postulate set, I insist on claiming Mises as my forerunner and on asking the economists now called “Austrians” (e.g. Garrison and Skousen) to call themselves Hayekians.

But there is one quotation of Mises' that I like best. In fact, I like it so much that I have budgeted $40 a day on the following Google Adwords campaign, which promotes just this one Mises quotation:

Defend First Amendment
Movement to Burn Toxic Textbooks
Seeks to Ban Books by Autistics.

Google Adwords charges me fourteen cents per visitor. Thus, every twenty-five days, at a cost of only $1000, I introduce over seven thousand people to the great economist's writing. Soon, hundreds of thousands of people who have never heard of Mises before will be familiar with his opposition to the German Historical School... They will be familiar with how Menger once opposed Gustav Schmoller, just as I now oppose Edward Fullbrook.

What do you guys think? Do you like this Mises quotation as much as I do?