noun: a tendency to be hopeful and to expect that good things will probably happen
noun: a general disposition to expect the best in all things
noun: the optimistic feeling that all is going to turn out well

Cayce
"If each and every disappointment, each and every condition that arises, is used as a stepping-stone for better things, looking for it and expecting it, then there will be continued optimism." [Cayce (462-10)]