John Henry Newman believed that all Christian doctrines must be accessible to all Christian believers, both the intellectually sophisticated and the uneducated. This implied that the intellectually simple must be able to apprehend and assent to mysteries, such as that of the Trinity. This paper discussion what Newman understood by the idea of mystery. Mystery for Newman was primarily a hermeneutical problem. Mystery was a result of the human incapacity and inability to grasp the fullness of truth. In Newman, the hermeneutical problematic is one of limitations of language thus leading to submission of intellect to a sublime truth.