"When we are lulled into somnolence by lack of challenge every molehill tends to become a mountain, every minor inconvenience an intolerable imposition. For a self-chosen reality tends to become a prison. The factors that protect and insulate civilized man can easily end by suffocating him unless he possesses a high degree of self-discipline, the 'highly developed vital sense' that Shaw speaks of. And since clever and sensitive people are inclined to lack self-discipline, a high degree of culture usually involves a high degree of pessimism. This is what has happened to Western civilisation over the past two centuries. It explains why so many distinguished artists, writers and musicians have taken such a negative view of the human situation."