It amazes me to go through my archives. I treat my blog as throwaway writing, but it isn't. It's not about temporary things. If I read something a year after I wrote it, it still holds meaning. Sometimes it holds more meaning.
I really consider it a good sign. Writing should be lasting and meaningful. If the entry for any random day can be reread in the future and still appreciated, still made to make me think, still able to make me laugh, then it was definitely a good entry.
Go and pull out an old piece of writing. Does it still affect you? Why or why not? If so, can you repeat it? If not, what can you change to make it better?