Every autobiography is concerned with two characters, a Don Quixote, the Ego, and a Sancho Panza, the Self. If the same person were to write his autobiography twice, first in one mode and then in the other, the two accounts would be so different that it would be hard to believe that they referred to the same person.

"Hic et Ille", p. 96 - The Dyer's Hand, and Other Essays (1962)