If the heart wanders or is distracted, bring it back to the point quite gently -- and even if you do nothing during the whole of your prayer but bring your heart back, though it went away every time you brought it back, your time would be very well employed.
On a dark afternoon -- I was ten or eleven -- I was walking on a country road, on my left a patch of curly kale, on my right some yellowed Brussel sprouts. I felt a snowflake on my cheek, and from far away in the charcoal-gray sky I saw the approach of a snowstorm. I stood still. Some flakes were now falling around my feet. A few melted as they hit the ground. Others stayed intact. Then I heard the falling of the snow, with the softest hissing sound.
I stood transfixed, listening ... and knew what can never be expressed: that the natural is supernatural, and that I am the eye that hears and the ear that sees, that what is outside happens in me, that outside and inside are unseparated. It is the inexpressible, and the inexpressible is the only thing that it is worthwhile expressing.