”If the statistics are right, the Jews constitute 
  but one per cent. of the human race. It suggests a nebulous dim puff of star-dust 
  lost in the blaze of the Milky Way. Properly the Jew ought hardly to be heard 
  of; but he is heard of, has always been heard of. He is as prominent on the 
  planet as any other people, and his commercial importance is extravagantly out 
  of proportion to the smallness of his bulk. His contributions to the world's 
  list of great names in literature, science, art, music, finance, medicine, and 
  abstruse learning are also away out of proportion to the weakness of his numbers. 
  He has made a marvellous fight in this world, in all the ages; and has done 
  it with his hands tied behind him. He could be vain of himself, and be excused 
  for it. The Egyptian, the Babylonian, and the Persian rose, filled the planet 
  with sound and splendor, then faded to dream-stuff and passed away; the Greek 
  and the Roman followed, and made a vast noise, and they are gone; other peoples 
  have sprung up and held their torch high for a time, but it burned out, and 
  they sit in twilight now, or have vanished. The Jew saw them all, beat them 
  all, and is now what he always was, exhibiting no decadence, no infirmities 
  of age, no weakening of his parts, no slowing of his energies, no dulling of 
  his alert and aggressive mind. All things are mortal but the Jew; all other 
  forces pass, but he remains. What is the secret of his immortality?”  
Mark Twain, "Considering the Jews" in Harper's Magazine (1899)