Which life?

In the short interval between the time when my beard began to sprout and now, when it is beginning to turn grey, in this half-century more radical changes and transformations have taken place than in ten generations of mankind; and each of us feels: it is almost too much! My today and each of my yesterdays, my rises and falls, are so diverse that I sometimes feel as if I had lived not one, but several existences, each one different from the others. For it often happens that when I carelessly speak of “my life,” I am forced to ask, “which life?"

 Stefan Zweig, in The world of yesterday (1942)