[1] This property is commonly associated with philosophy, aspects of existence, and similar concepts that are inherently "too great", complex or abstract to be communicated adequately.
Illogical statements, principles, reasons and arguments may be considered intrinsically ineffable along with impossibilities, contradictions and paradoxes.
Terminology describing the nature of experience cannot be conveyed properly in dualistic symbolic language; it is believed that this knowledge is only held by the individual from which it originates.
The ineffability about God is affirmed by the First Vatican Council's apostolic constitution Dei Filius: The holy Catholic Apostolic Roman Church believes and confesses that there is one true and living God, Creator and Lord of heaven and earth, almighty, eternal, immense, incomprehensible, infinite in intelligence, in will, and in all perfection, who, as being one, sole, absolutely simple and immutable spiritual substance, is to be declared as really and essentially distinct from the world, of supreme beatitude in and from Himself, and ineffably exalted above all things which exist, or are conceivable, except Himself.God's ineffability deals with His being infinite, invisible and incomprehensible.
This dogmatic definition comes from a longtime tradition: Tertullian, Athenagoras of Athens, and Clement of Alexandria believed that ineffability is a property of God.