Let’s review 1 Cor 11:27-30:
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. But let a man prove himself: and so let him eat of that bread, and drink of the chalice. For he that eateth and drinketh unworthily, eateth and drinketh judgment to himself, not discerning the body of the Lord. Therefore are there many infirm and weak among you, and many sleep.
Tough, right?
Does “discern body of the Lord” mean, “notice and attend to the needs of the poor around you?” This is what libs suggest. It’s also what writers in the ancient Church, such as St. John Chrysostom would suggest, and vigorously so! Also, there is a section in Amoris laetitia that has this interpretation. There is nothing in the least new about this. It’s been around for centuries.
Does “discern the body of the Lord” mean merely attend to the needs of the poor? No.
It can and does mean that, but that is not the only thing it means.
It also means being properly disposed to receive the Eucharist, that is, not receiving Communion in the state of mortal sin.
1 Cor 11 refers to our entire moral selves. Hence, 1 Cor 11 involves both concern for mortal sin and concern for the poor. These are, as a matter of fact, flip sides of the same coin: if you are not (according to your ability and circumstances) taking care of the poor, you sin.
Right?
But there are other ways of sinning other than guilty negligence of the poor.
Right?
At this point, review what St. John Paul II wrote about 1 Cor 11 in his Encyclical Ecclesia de Eucharistia 36:
“Along these same lines, the Catechism of the Catholic Church rightly stipulates that “anyone conscious of a grave sin must receive the sacrament of Reconciliation before coming to communion”.74 I therefore desire to reaffirm that in the Church there remains in force, now and in the future, the rule by which the Council of Trent gave concrete expression to the Apostle Paul’s stern warning when it affirmed that, in order to receive the Eucharist in a worthy manner, “one must first confess one’s sins, when one is aware of mortal sin”.75
74 No. 1385; cf. Code of Canon Law, Canon 916; Code of Canons of the Eastern Churches, Canon 711.
75 Address to the Members of the Sacred Apostolic Penitentiary and the Penitentiaries of the Patriarchal Basilicas of Rome (30 January 1981): AAS 73 (1981), 203. Cf. Ecumenical Council of Trent, Sess. XIII, Decretum de ss. Eucharistia, Chapter 7 and Canon 11: DS 1647, 1661.
That was refreshingly clear.
Amoris laetitia didn’t change what John Paul wrote (and which millennial tradition of commentaries and teachings have maintained).
The Church’s doctrine is the same today as it was before 8 April 2016.
The Church’s law is the same today as it was before 8 April 2016.
It remains that a priest cannot be required not to follow the Church’s law and he cannot be prevented from preaching Catholic doctrine, nor can he be compelled to preach something against the Church’s doctrine.

Really useful!
On another note, since I firmly hold that no real renewal of the Church is possible without a renewal of our sacred worship, Peter Kwasniewski pointed out that 1 Cor 11:27-29 was purposely excluded from the Novus Ordo Lectionary. It is, however, in the older, traditional form of Holy Mass, for Corpus Christi and for Votive Masses of the Most Holy Eucharist. A quick consultation of the new book Index Lectionum: A Comparative Table of Readings for the Ordinary and Extraordinary Forms of the Roman Rite shows you that it is missing from the Novus Ordo and is present in the TLM. My post on the book HERE. US HERE – UK HERE – ITALY HERE
Thus, Summorum Pontificum, that great gift of Benedict XVI to the Church, that profound aid in his “Marshall Plan” to rebuild after the devastation against the encroaching dictatorship of relativism, provides a necessary corrective for a serious gap in our worship and, therefore, identity. Once again we hear in our churches, in the context of Mass, “For he that eateth and drinketh unworthily, eateth and drinketh judgment to himself, not discerning the body of the Lord”, knowing full well that it means that we mustn’t approach the Eucharistic Lord for Communion in the state of mortal sin.