Fern Hill or Time (Before the Fall)?

Here's one by Dylan Thomas I came across tonight in one of my poetry anthologies. Like "The Candle Indoors" by Hopkins, it's also a poem I don't remember reading before. And though it is a beautiful poem, I feel a sense of sadness and inevitability in the final two lines. Time chains you and you're dying the moment you were born. You just might not know it yet while you're young, you're innocent.

But must we be jaded by time?