(e) Heresy is “assented to obstinately,” This is the distinctive note of heresy, and hence those who assent to error through ignorance, whether vincible or invincible, are not heretics, if they are willing to accept the truth when known. A heretic, therefore, is one who knowingly refuses to admit a truth proposed by the Church, whether his motive be pride, desire of contradicting, or any other vice. (f) Heresy is held “by one who had sincerely embraced the faith of Christ.” This includes only catechumens and the baptized, for others who deny the truths of faith are Jews or infidels, not heretics. 827. The sin of heresy (heresy before God), as just defined, differs from the canonical crime of heresy (heresy before the Church), since it is more inclusive. (a) These two differ as regards the error in the intellect, for one is guilty of the sin, but not of the crime, even without error--that is, if one denies what is really false, thinking it to be defined doctrine; (b) they differ as regards the obstinacy in the will, for one is guilty of the sin, but not of the crime, if one is prepared in mind and purpose to deny a truth not yet defined, if it is ever defined; (c) they differ as regards the truths rejected, for one is guilty of the sin, but not of the crime, if one rejects divinely revealed truths not defined as such by the Church; (d) they differ as regards the person who denies, for not everyone who merely accepted the faith of Christ can be guilty of the crime of heresy, but only those who after Baptism retain the name of Christian (Canon 1325, Sec.2). 828. Various Kinds of Heresy.--(a) Heresy is positive when error is accepted (e.g., the doctrine of consubstantiation); it is negative when truth is denied (e.g., the doctrine of transubstantiation). (b) Heresy is internal, when it is in the mind alone and not externally professed. It is external, when expressed in an external way (i.e., by words, signs, acts or circumstances that clearly indicate present heresy), if this is done not for a good purpose, such as that of asking advice, but for the purpose of professing error. (c) External heresy is occult, when it is made known to no one, or only to a few; it is public or notorious, when it is made known before a large number and cannot be concealed. Example: One who calls himself a Catholic and is known as such, but who in conversation with a few intimate friends declares himself a Modernist, is an occult heretic. One who declares in public addresses or articles that he agrees with Modernism, or who joins openly an heretical sect or has always belonged to one, is a public heretic. (d) Occult and public heresy may be either formal or material, according as one is in good or bad faith. Heresy is formal, if its malice is known and willed by the one in error; if its malice is not known by him, it is material. 829. Heresy is not formal unless one pertinaciously rejects the truth, knowing his error and consenting to it.