Dei Filius, Of Revelations, Canon 3

3. If any one shall say that man can not be raised by divine power to a higher than natural knowledge and perfection, but can and ought, by a continuous progress, to arrive at length, of himself, to the possession of all that is true aud good: let him be anathema.

Translation: Henry Edward Manning, Petri Privilegium (1871), reproduced in Philip Schaff, Creeds of Christendom II, via CCEL.