“In adolescence, I hated life and was continually on the verge of suicide, from which, however, I was restrained by the desire to know more mathematics. Now, on the contrary, I enjoy life; I might almost say that with every year that passes I enjoy it more…very largely it is due to a diminishing preoccupation with myself. Like others who had a Puritan education, I had the habit of meditating on my sins, follies, and shortcomings. I seemed to myself - no doubt justly - a miserable specimen. Gradually I learned to be indifferent to myself and my deficiencies; I came to center my attention increasingly upon external objects: the state of the world, various branches of knowledge, individuals for whom I felt affection…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. It may lead to the keeping of a diary, to getting psychoanalyzed, or perhaps to becoming a monk. But the monk will not be happy until the routine of the monastery has made him forget his own soul. The happiness which he attributes to religion he could have obtained from becoming a crossing-sweeper, provided he were compelled to remain one. External discipline is the only road to happiness for those unfortunates whose self-absorption is too profound to be cured in any other way.”