Since most of us are not accustomed to doing much listening in our praying, it is something we have to learn how to do. While we may think that the word "practice" has no place in a discussion of spiritual disciplines, practice is what we must do with each discipline which is a part of our life. We learn to play a musical instrument not by talking about it, but practicing. When we make a conscious decision to be more of a listener in our prayer life, it is not likely to just happen the first time we decide to listen. Like it or not, for most of us it requires going through seasons of frustration and failure.
One of the reasons is that listening for the voice of God requires we enter into silence. Silence is not a room in which we are comfortable. Of course, the greatest problem has nothing to do with the external silence, but the silence that is internal. We can turn off all the noise makers around us, but stilling the things which start stirring around inside of us as we try to listen for the voice of God is an even greater problem. Turning off the external noise makers does nothing to quiet the internal voices which call for our ear and our attention. As sure as we start listening for God to speak, we will start hearing voices reminding us of some unfinished business at work, or a newly discovered health problem, or some moment filled with regret and a desire for a "do over."
When we pray and find our mind wandering away from our intention to pray, it is not just an issue of concentration, but one of not being able to silence the inner distracting voices. What may be discovered at this point is that centering techniques may be helpful, but, perhaps, not as helpful as asking for the help of the Holy Spirit. While it may be humbling to have to ask for help at the very beginning of this prayer experience, it may be the place we need to go before our heart can be freed to listen for the voice of God.