Pessimism is not in being tired of evil but in being tired of good. Despair does not lie in being weary of suffering, but in being weary of joy. It is when for some reason or other good things in a society no longer work that the society begins to decline; when its food does not feed, when its cures do not cure, when its blessings refuse to bless.
The collected works of G.K. Chesterton (ed. Ignatius Pr, 1987) - ISBN: 9780898701173