826. Heresy.--Heresy is defined as “an error manifestly opposed to faith and assented to obstinately by one who had sincerely embraced the faith of Christ.” (a) It is called “error,” that is, positive assent given to error, or dissent from truth. Hence, those who merely act or speak as if they do not believe, but who internally do believe, are not heretics, although in the external forum they may fall under the presumption of heresy. Similarly, those who have doubts or difficulties in matters of faith, but who do not allow these to sway their judgment, are not guilty of heresy, since they give no positive assent to error (see 842 sqq.). Examples: Titus is internally convinced of the truth of the Church’s teaching; but he attends Protestant services, says he does not believe the Trinity, refuses to make a profession of faith required by the Church, separates himself from obedience to the authorities of the Church, and calls himself an independent. By his former external acts he makes himself guilty of disobedience and falls under the suspicion of heresy, and by his last external act he incurs the guilt of schism; but, since internally he does not disbelieve, he is not a heretic. Balbus has doubts before his mind from his reading or conversation, but he must immediately give his whole attention to a very pressing matter of business, and so gives neither assent nor dissent to the doubts. He is not guilty of heresy, since he formed no positive erroneous judgment. (b) Heresy is “opposed to faith.” By faith here is understood divine faith, especially divine and Catholic faith (see 755). Hence, an error opposed to what one held to be a genuine private revelation, or to the public revelation, especially when dogmatically defined by the Church, is heretical. On the contrary, an error opposed to ecclesiastical faith alone, to human faith, or to human science, is not of itself heretical. Examples: The Saints who received special private revelations from Christ with proofs of their genuineness would have been guilty of heresy, had they refused to believe. Sempronius refuses to believe some Biblical teachings about things not pertaining to faith and morals and not expressly defined by the Church (e.g., chronological, physical, geographical, statistical data). If he really believes that what he denies is contained in the Bible, he is guilty of heresy. Balbus admits the infallibility and authority of the Church, but he does not believe that a certain Saint solemnly canonized is in heaven, that a certain non-infallible decision of a Roman Congregation is true, that certain second lessons of the Breviary or certain relics are genuine. He is not a heretic, since, as supposed, he denies no revealed truth; but in his first unbelief he sins against ecclesiastical faith; in his second unbelief, if the contrary of the decision has not been clearly established, he sins against the duty of religious assent; in his