I remember a quote from Frederick Buechner in his book The Longing for Home:
“In the entire history of the universe, let alone in your own history, there has never been another day just like today, and there will never be another just like it again. Today is the point to which all your yesterdays have been leading since the hour of your birth. It is the point from which all your tomorrows will proceed until the hour of your death. If you were aware of how precious today is, you could hardly live through it. Unless you are aware of how precious it is, you can hardly be said to be living at all.”
It’s fascinating to think of how precious today is!