1 Corinthians 3:1-3
4 From this place we learn that Christ had good reason for saying, “He that does evil comes not to light;” and that unclean life is an obstacle to high doctrines, not suffering the clear-sightedness of the understanding to show itself. As then it is not in any case possible for a person in error, but living uprightly, to remain in error; so it is not easy for one brought up in iniquity, speedily to look up to the height of the doctrines delivered to us, but he must be clean from all the passions who is to hunt after the truth: for whoso is freed from these shall be freed also from his error and attain unto the truth. For do not, I beseech you, think that abstinence merely from covetousness or fornication may suffice you for this purpose. Not so. All must concur in him that seeks the truth. Wherefore says Peter, “Of a truth I perceive that God is no respecter of persons; but in every nation he that fears Him, and works righteousness, is acceptable to Him:” that is, He calls and attracts him unto the truth. Do you see not Paul, that he was more vehement than any one in warring and persecuting? Yet because he led an irreproachable life, and did these things not through human passion, he was both received, and reached a mark beyond all. But if any one should say, “How does such a one, a Greek, who is kind, and good, and humane, continue in error?” this would be my answer: He has some other passion, vainglory, or indolence of mind, or want of carefulness about his own salvation, accounting that all things which concern him are drifted along loosely and at random. Peter calls the man irreproachable in all things one that “works righteousness,” [and Paul says] “touching the righteousness which is in the law found blameless.” Again, “I give thanks to God, whom I serve from my forefathers with a pure conscience,” How then, you will say, were unclean persons considered worthy of the Gospel? Because they wished and longed for it. Thus the one sort, though in error, are attracted by Him, because they are clean from passions; the others, of their own accord approaching, are not thrust back. Many also even from their ancestors have received the true religion.
1 Corinthians 3:3
5. “For whereas there is among you jealousy and strife.”
At this point he prepares himself to wrestle with those whose part was obedience: for in what went before he has been casting down the rulers of the Church, where he said that wisdom of speech is nothing worth. But here he strikes at those in subjection, in the words,
Source: Homilies on First Corinthians (New Advent)