It happened that in the years from 1895 onwards . . . the announcement of my unpleasing discoveries had as its result the severance of the greater part of my human contacts; I felt as though I were despised and universally shunned. In my loneliness I was seized with a longing to find a circle of picked men of high character who would receive me in a friendly spirit in spite of my temerity. Your society was pointed out to me as the place where such men were to be found.

That you were Jews could only be agreeable to me; for I was myself a Jew, and it had always seemed to me not only unworthy but positively senseless to deny the fact. What bound me to Jewry was (I am ashamed to admit) neither faith nor national pride, for I have always been an unbeliever and was brought up without any religion though not without a respect for what are called the ‘ethical’ standards of human civilization. Whenever I felt an inclination to national enthusiasm I strove to suppress it as being harmful and wrong, alarmed by the warning examples of the peoples among whom we Jews live. But plenty of other things remained over to make the attraction of Jewry and Jews irresistible - many obscure emotional forces, which were the more powerful the less they could be expressed in words, as well as a clear consciousness of inner identity, the safe privacy of a common mental construction. And beyond this there was a perception that it was to my Jewish nature alone that I owed two characteristics that had become indispensable to me in the difficult course of my life. Because I was a Jew I found myself free from many prejudices which restricted others in the use of their intellect; and as a Jew I was prepared to join the Opposition and to do without agreement with the ‘compact majority’.

Source: Freud Ovuvres Complètes (Anglais) Studies on Hysteria,"  http://pre.docdat.com/docs/index-127074.html?page=486#1393278