God can use many different things to inspire us, and often we can hear his voice through various spiritual writings. This may be the Bible, biography of a saint, or any book on prayer and the spiritual life.
Yet sometimes we don't pause to ask God to inspire us and make it clear what he wants us to do.
Here is a short prayer from Father Francis Xavier Lasance and his book With God: A Book of Prayers and Reflections. It is a simple rhyming prayer that can be easily memorized and prayed each time we sit down to read (or listen to) a spiritual book.