I have seen worse and had to face worse. Nature itself provides the final unquestionable manifestation of optimism in practice. Each year dies and is reborn, despite wars and plagues, depressions and oppressions, democracies or dictatorships. As Longfellow puts it, 'Tis always morning somewhere, and above The awakening continents, from shore to shore, Somewhere the birds are singing evermore. A gale cannot blow forever, the rain must cease to fall.
Nothing man can do can halt the endless pattern.
I know there is nothing better for them, than to rejoice, and to do good so long as they live. Example taken from Moynihan, William T., Donald W. Lee, and Herbert Weil, Jr. Reading, Writing and Rewriting.