The more you know, the less you get impressed
But before thinking it's a sad thing, remember it's also the less you get frustrated.
And after that "plateau of emotions", and after your heart feel secure enough, it opens up to life completely.
You then know that however hard things get, everything will sort itself out for the nature of things not for your sake, so your downs get up sooner than before.
And also you know then that no matter how good life gets it is not going to be like that forever, so you don't take it for granted, nor you cling to it and make it harder to let go, so it's a little bit easier on you for your ups to get down.
And your heart gets to breatheAnd you get to live