Hope is like a distant quivering flame when sailing the dark seas of life. If you believe in it, it has the power to keep you afloat and lead you ashore, but when you stop believing in it you sink in the metaphorical darkness and vastness of the sea called life.
Hope is needed for survival just as much as any other "vital necessity". Like air to breath, food to sustain our bodies, love to sustain our hearts, we need "hope" to sustain our minds and souls.
Hope lets us endure life's vicissitudes, dreams shattered, loves lost and in fact hope gives us "hope" when none could rationally exist. In a cold scientific sense it cannot be captured or explained in a predictive equation of future outcomes. Hence we turn to religion, philosophy, literature, theater and music to feed our hungry & famished souls...we find hope in the brave deeds of a mythical super hero, in the passionate words of a poet, in the pop song that transports us to a different world, or in the guardian angel protecting us...but the paradox of hope is that it works best if you unquestionably and faithfully believe in it, even though you can't tell if it is delusional or real at that moment. I hope we all have indomitable strength to find "hope" in such dark times.