So indulgent is man toward himself, that, while doing evil, he always endeavors as much as he can to suppress the idea of sin. It was this, apparently, which induced Plato (in his Protagoras) to suppose that sins were committed only through ignorance.Institutes, Book 2, Chapter 2
There is in many an affected ignorance, which is very criminal; they are willingly ignorant, as the apostle says of the scoffers who shall arise in the last time, or rather they are unwilling to understand what they might, they know not, nor will they understand, they walk on in darkness; they do not choose to make use of but shun the means of knowledge, and shut their eyes against all light and conviction;
Some because of their sinful lusts they indulge themselves in, and their contempt of the means of light and knowledge, and the stubborn choice they make of error and falsehood, are given up to judicial blindness and hardness of heart; as many among the heathens, who because they liked not to retain God in their knowledge, were given up to a reprobate mind, or to a mind void of judgment, and so imbibed notions and performed actions not convenient