The Semantic of Infallibility in the Horizon of Shii Thoughts

One of the traditionally controversial theological issues among the Muslim theologians, is to attempt to understand the meaning and quality of the prophets and Imams infallibility; so that in explaining the subject of infallibility, we find different approaches and resolutions that with belief in each one, this concept would have different structure from the other case. As if one understands infallibility accompanied with an approach that is indescribable by human knowledge, it would have a granted concept; but if one understands it accompanied with experiential and acquired approach, it would be the effect of the two phenomena of knowledge and willing, and access to it would be possible in different degrees.In this paper, by excavating in Shii thinker's thoughts, it is attempted to examine the viewpoints that thinkers had suggested and finally it emphasizes that infallibility is a transcendental characteristic which not only did not distinguish the infallible from his/her other fellow mankind, but also this characteristic is one his/her optional perfections.