be an Englishman or not—to admire everything great and good, whether nursed on your native soil or not—I found you to be more than mere Englishmen , members of a single, isolated nation, I found you to be Men, members of the great and universal family of Mankind, who know their interest and that of all the human race to be the same. And as such, as members of this Family of “One and Indivisible” Mankind, as Human Beings in the most emphatical meaning of the word, as such I, and many others on the Continent, hail your progress in every direction and wish you speedy success.
Go on then, as you have done hitherto. Much remains to be undergone; be firm, be undaunted—your success is certain, and no step you will have to take in your onward march will be lost to our common cause, the cause of Humanity!
Freidrich Engels. Barmen (Rhenan Prussia) , March 15th, 1845