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.
One evening I laid my finger on my cheek and found to my surprise that it was wet. I wondered what those tears meant. What was I crying for? I wasn't consciously sad at all or consciously happy. I noticed at this moment that behind it all there was a joy, deeper than any personal joy. It was a joy in the face of the beauty of being. A joy at all the wonderful and lovable people I had already met in my life. But at the same moment, I experienced the exact opposite emotion. I hadn't known before that two such contrary feelings could coexist. Because the tears were at the same time tears of immense sadness, a sadness at what we're doing to the earth, a sadness at the people whom I have already hurt in my life, and a sadness too at my own emptiness and stupidity. I still don't know whether joy or pain had the upper hand -- both lay so close to one another.