"Never confuse optimism and hope. Never confuse the two. Optimism is the belief that things are going to get better. Hope is the belief that if we work hard enough we can make things better. It needs no courage whatsoever, only a certain kind of naivite, to be an optimist. It needs a great deal of courage to have hope." -- Rabbi Jonathan Sacks
I don't agree with Rabbi Sacks' definition of hope, but if you replace "optimism" and "hope" with "passive optimism" and "active optimism" I think he has a good point.