Einstein thanks Melville for his letter and manuscript. Einstein disagrees that "people can be roused in behalf of a cause by reasoning with them." He believes that "to produce strong movements of an active character one has to possess the art to create powerful emotions or, if they exist already, to organize them." He refers to Gandhi as an example. Einstein hopes the book is successful in that it may "help to dampen dangerous nationalistic passions" and comments on Melville's style as "lucid and simple though perhaps not quite aggressive and pungent enough (I am thinking of Voltaire and Bertrand Russell)."

The letter is enclosed with Melville's manuscript of Populism and is a negative photostat of the original.