My philosophy is to do the best you can for somebody. Help. It's not just what do you for yourself. It's how you treat people decently. The golden rule. There isn't big anything better than the golden rule. It's in every major religion in one language or another.
There is no word for feeling nostalgic about the future but that's what a parent's tears often are a nostalgia for something that has not yet occurred. They are the pain of hope the helplessness of hope and finally the surrender to hope.
