33 Neither let that imprudent error or vain stupor of some move you, who, although they are involved in so grave a crime, are struck with blindness of mind, so that they neither understand nor lament their sins. This is the greater visitation of an angry God; as it is written, “And God gave them the spirit of deadness.” And again: “They received not the love of the truth, that they might be saved. And for this cause God shall send them the working of error, that they should believe a lie; that they all might be damned who believed not the truth, but had pleasure in unrighteousness.” Unrighteously pleasing themselves, and mad with the alienation of a hardened mind, they despise the Lord's precepts, neglect the medicine for their wound, and will not repent.
Thoughtless before their sin was acknowledged, after their sin they are obstinate; neither steadfast before, nor suppliant afterwards: when they ought to have stood fast, they fell; when they ought to fall and prostrate themselves to God, they think they stand fast. They have taken peace for themselves of their own accord when nobody granted it; seduced by false promises, and linked with apostates and unbelievers, they take hold of error instead of truth: they regard a communion as valid with those who are not communicants; they believe men against God, although they have not believed God against men.
Source: The Treatises of Cyprian (New Advent)