but, and, and most importantly.

You're gonna miss this
You're gonna want this back
You're gonna wish these days hadn't gone by so fast
These Are Some Good Times
So take a good look around
You may not know it now
But you're gonna miss this

but

Thus says the LORD:
Remember not the events of the past,
the things of long ago consider not;
see, I am doing something new!

and

“life is a great & wondrous mystery, & the only thing we know that we have for sure is what is right here right now. don’t miss it.”

and, most importantly,

"just when the caterpillar thought the world was over, it became a butterfly."