There is a qualitatively different kind of waiting, one that requires your total alertness. Something could happen at any moment, and if you are not absolutely awake, absolutely still, you will miss it. This is the kind of waiting Jesus talks about. In that state, all your attention is in the Now. There is none left for daydreaming, thinking, remembering, anticipating.

Eckhart Tolle

from The Power of Now: A Guide to Spiritual Enlightenment