" When people who are tolerably fortunate in their outward lot do not find in life sufficient enjoyment to make it valuable to them, the cause, generally is, caring for nobody but themselves. To those who have neither public nor private affections, the excitements of life are much curtailed, and in any case dwindle in value as time approaches when all selfish interests must be terminated by death: while those who leave after them objects of personal affection, and especially those who have also cultivated a fellow-felling with the collective interests of mankind, retain as lively an interest in life on the eve of death as in the vigour of youth and health. Next to selfishness, the principal cause which makes life unsatisfactory, is want of mental cultivation. "

― John Stuart Mill , Utilitarianism