"I was not born happy. ... Now, on the contrary, I enjoy life. ... Very largely [this] is due to a diminishing preoccupation with myself. ... Gradually I learned to be indifferent to myself and my deficiencies; I came to center my attention increasingly on external objects: the state of the world, various branches of knowledge, individuals for whom I felt affection. External interests, it is true, bring each its own possibility of pain. ... But pains of this kind do not destroy the essential quality of life, as do those that spring from disgust with self. And every external interest inspires some activity which, so long as the interest remains alive, is a complete preventive of ennui. Interest in oneself, on the contrary, leads to no activity of a progressive kind." [page 18] Much of Conquest is devoted to the superiority of external interests to introverted interests. I discuss this in Theme B.
Russell goes on to describe common types of self-absorption: the sinner, the narcissist, and the megalomaniac. He finds a common factor in them: "The typical unhappy man is one who, having been deprived in youth of some normal satisfaction, has come to value this one kind of satisfaction more than any other, and has therefore given to his life a one-sided direction, together with a quite undue emphasis upon the achievement as opposed to the activities connected with it." [page 22]