Clement of Alexandria, on 1Cor 11:27

“Therefore whosoever shall eat this bread, or drink the chalice of the Lord unworthily, shall be guilty of the body and of the blood of the Lord.”

“Both must therefore test themselves: the one, if he is qualified to speak and leave behind him written records; the other, if he is in a right state to hear and read: as also some in the dispensation of the Eucharist, according to custom enjoin that each one of the people individually should take his part. One's own conscience is best for choosing accurately or shunning. And its firm foundation is a right life, with suitable instruction. But the imitation of those who have already been proved, and who have led correct lives, is most excellent for the understanding and practice of the commandments. "So that whosoever shall eat the bread and drink the cup of the Lord unworthily, shall be guilty of the body and blood of the Lord. But let a man examine himself, and so let him eat of the bread and drink of the cup." It therefore follows, that every one of those who undertake to promote the good of their neighbours, ought to consider whether he has betaken himself to teaching rashly and out of rivalry to any; if his communication of the word is out of vainglory; if the only reward he reaps is the salvation of those who hear, and if he speaks not in order to win favour.”

Imported from an open dataset — not yet checked against the printed edition.