In spanish we say "la esperanza es lo último que se pierde" (hope is the last we loose). This is an old feeling and an old knowledge. In the ancient greek myth of Prometheus we can find Pandora's box, the box gods had put in all the pains and disgraces as a punishment to mankind. When Epimetheus (Prometheus brother) saw what was going out, he jump to close the lid. Only hope was left at the bottom.
I've never been certain if the story means we will always have hope with us or we will never see the hope that came linked to the pain.
YES, we need hope.
On the darkest days, hope and laughter are all we have to get through the absurdity of our lives.