My youthful friendships in the time of which I am here speaking (about 1880-1890) had in the further course of my life a special import. They forced me into a sort of double mental life. The struggle with the riddle of cognition, which then filled my mind more than all else, aroused in my friends always, to be sure, a strong interest, but very little active participation. In the experience of this riddle I was always rather lonely. On the other hand, I myself shared completely in whatever arose in the existence of my friends. Thus there flowed along in me two parallel currents of life: one which I as a lone wanderer followed, the other which I shared in vital companionship with men bound to me by ties of affection. But this twofold life was on many occasions of profound and lasting significance for my development.
Source: Rudolf Steiner – GA 28 – The Story of My Life – Chapter IV