Mental acceptance of truth is not faith. To produce faith, truth must penetrate beyond the conscious mind into the inner centre and source of life, which is the heart. Truth received intellectually by the mind may be sterile and ineffective, truth received by Faith into the heart is dynamic and life changing. A person who truly believes will be changed by what He believes. Faith is in the Heart!

http://www.fciministries.co.za/blog/entry/advancing-the-kingdom-of-god