Catechism of the Catholic Church

In order to articulate the dogma of the Trinity, the Church had to develop its own terminology with the help of certain notions of philosophical origin: "substance," "person" or "hypostasis," "relation," and so on. In doing this, she did not submit the faith to human wisdom, but gave a new and unprecedented meaning to these terms, which from then on would be used to signify an ineffable mystery, "infinitely beyond all that we can humanly understand." (170)