Unless one is more or less crazy, one cannot be enthusiastic or even peaceful in material life.
It is customary throughout the world that a condemned man is offered a sumptuous last meal. For the condemned man, however, such a feast is a chilling reminder of his imminent death, and therefore he cannot enjoy it. Similarly, no sane human being can be satisfied in material life, because death is standing near and may strike at any moment. If one is sitting in one’s living room with a deadly snake at one’s side, knowing that at any moment the poisonous fangs might pierce the flesh, how can one sit peacefully and watch television or read a book? Similarly, unless one is more or less crazy, one cannot be enthusiastic or even peaceful in material life. Knowledge of the inevitability of death should encourage one to become determined in spiritual life.
Source: A.C. Bhaktivedanta Swami Prabhupada (2014 edition), “Srimad Bhagavatam”, Eleventh Canto, Chapter 10 – Text 20.