On p. 94 of "Starting Well: Building a Strong Foundation for a Lifetime of Ministry," authors Richard Clinton and Paul Leavenworth cite three major hindrances and two additional hindrances to our hearing God:
1. Unbelief -- an unwillingness to trust God and His ability to come through on His promises.
2. An undeveloped spirit -- a lack of sensitivity to the Spirit based in a dependence upon sight rather than faith.
3. A spirit of deafness -- an inability to hear because of unforgiveness in our lives toward self, others, and/or God. Unforgiveness can provide Satan an inroad into our lives for "torment."
The two additional hindrances to our hearing God are:
4. A callused conscience -- a lack of moral sensitivity because of sin and rationalization.
5. Neglect -- an inability to hear because we are not spending time with God.
This list originally comes from chapters 3-4 of Larry Lea's book "The Hearing Ear."