When you hear mindfulness people say something like, “Life is like a dream,” one thing they mean is that more than 99.99% of the stuff going on in our minds are thoughts about the past and the future. (Past happiness or regrets, and future hopes and concerns.) Because the only thing that’s real in the present moment is what’s actually happening in *only this moment*, anything that’s outside of this moment is in a strict sense no longer real.
Along this line of thinking I like Eckhart Tolle’s two quotes, “The present moment is all you ever have” — you know that to be true for sure if you’ve ever lost consciousness, not knowing if you’d ever open your eyes again — and my favorite of his:
“The whole essence of Zen
consists in walking along
the razor’s edge of Now.”