According to Imam, it is clear that the submission, which is the gratification and comfort of the heart, is quite a different thing from knowledge, which is the gratification of the mind.
It is possible that one can logically prove the existence of the Great Intelligent Designer, the Unity of His Divine Being, the Day of Judgment and other true beliefs, but such a belief cannot be considered as faith (iman), and the person cannot be regarded as a mu’min, but he may be counted among the non-believers, hypocrites and polytheists.