Is the past really that important?

There are some things that we stumble upon in life that takes us somewhere else—transports us to a place we've never been before; this is one of them:

And this is one of the best things I've ever heard: 

There is no greater silence than that of the universe, and yet, when you tell it your secrets, your fears, your worries...it listens. To gaze upon it, in all of its astonishing nothingness that encapsulates everything in existence; there is no up. no down, just fathomless dark gilded in starlight older than you and all of humanity in its entirety. How strange a feeling, to gaze upon the very boundless form of endlessness. To look out at infinity and realize exactly how much you add up to. Suddenly, when seen through the perspective of such vastness, life becomes a little more bearable. Worries and fears are but trivialities shadowed by this strange and indefinite life. So, whilst at the edge of forever, is the past that important? Different people will answer differently. Even as we speak, farewells are happening throughout the universe. The grief that we share is real, but there's nothing special about it. Remember that. It might help you focus on the here and now.