I'd hate to be that guy, but Wikipedia's pages on Amor fati and fatalism provide fairly good glimpses into this idea.

The basic idea here is that one may believe that there is such a thing as fate--an inevitability, if you will, but Nietzsche took it a step further to accept it whole-heartedly leading to the idea that every emotion good or bad is ultimately good because it was decidedly so. He embraced his place and every emotion he experienced within it. There is no regret, but in the same vein no hope, for Nietzsche, everything simply was as it should have been.