809. The Gift of Understanding must not be confused with the Beatific Vision. (a) A perfect penetration of the mysteries, which enables one to perceive their essence and causes (e.g., the how and the why of the Trinity), is given by the Beatific Vision; but such understanding removes all obscurity, and is therefore insociable with faith. (b) An imperfect penetration of the teachings of faith, which does not take away the obscurity and mysteriousness, is given by the Gift of Understanding, and is therefore sociable with faith. The effects of this Gift are: it distinguishes the truths of faith from false doctrines; it conveys a clear view of the credibility of the mystery of faith against all difficulties and objections; it gives knowledge of the supernatural import of the secondary truths of faith, that is, of those revealed happenings and facts that are not themselves supernatural (Luke, xxiv. 32); it gives understanding of the practical aspect of a mystery--for example, that the intratrinitarian relations of the Divine Persons are a model for the regulation of the Christian life, in knowledge and love of divine things. 810. The Gift of Knowledge, which like the other Gifts is had by all the just, must not be confused with sacred knowledge or theology, nor with the extraordinary gifts of infused knowledge and the charism of knowledge. (a) The Gift of Knowledge resembles theology in that it reproduces objectively what reason does when it argues from the visible world to the invisible Creator; but, while subjectively theology is the result of study in which one passes successively from premise to conclusion. Knowledge is the result of a divine light that may be found even in the illiterate, and it takes in at a glance all that is contained in a process of argumentation. Through this Gift the wonders of nature, the events of history, the arguments of philosophy, lead one firmly and spontaneously to the Last End and the supernatural realities of faith. (b) Infused knowledge may have for its object things purely natural (such as truths of philosophy and the ability to speak foreign languages), while the Gift of Knowledge is concerned only with faith, judging what is to be believed or done according to faith. (c) The charism of knowledge (I Cor., xii. 8) is a grace given one for the benefit of others, by which one is able to communicate to them successfully the teachings of faith; the Gift of Knowledge, on the contrary, proceeds from the habit of sanctifying grace, and is intended for the benefit of its recipient. 811. To each of the Gifts of the Holy Ghost correspond Beatitudes and Fruits (see 159).