96 Hence the true Christian, product of Christian education, is the supernatural man who thinks, judges and acts constantly and consistently in accordance with right reason illumined by the supernatural light of the example and teaching of Christ; in other words, to use the current term, the true and finished man of character. For, it is not every kind of consistency and firmness of conduct based on subjective principles that makes true character, but only constancy in following the eternal principles of justice, as is admitted even by the pagan poet when he praises as one and the same "the man who is just and firm of purpose." And on the other hand, there cannot be full justice except in giving to God what is due to God, as the true Christian does.
Source: Divini Illius Magistri (Vatican.va)