When I was a young student, the desire to read the immortal Don Quixote in the original of Cervantes led me to learn, untaught, the lovely Castilian tongue. Thanks to this youthful enthusiasm, I am able to-day—at an advanced age—to test the accuracy of your Spanish version of my works, the reading of which invariably provokes in me a lively appreciation of your very correct interpretation of my thoughts and of the elegance of your style. I am above all astonished that one who, like you, is neither a doctor nor a psychiatrist by profession should have been able to obtain so absolute and precise a mastery over material which is intricate and at times obscure.