Prayer never touches us as long as it remains on the surface of our lives, as long as it is nothing but one more of a thousand things that must be done. It is only when prayer becomes "the one thing necessary" that real prayer begins. Prayer begins to take on its full dimensions only when we begin to intuit that the subtle nothingness of prayer is everything.
You can't change the past
But you can ruin the present
By worrying about the future.