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.
Listen to old stones for information about survival. What a seashell has to say will surprise you. So, too, will words written on the wind. Listening to silence is hardest of all. You want to fill it up with conversation ... distractions ... noise. Resist the impulse. In silence, you can dream great dreams. You can discover your own music. Listening means hearing the voice within you. It never fails to tell you the truth, even if you don't want to hear it.