Christ taught His priesthood leaders that partaking the Sacrament unworthily could bring condemnation to those they were charged to minister to. Accordingly, He taught them who should take part in the Sacrament and who should not as well as who should be numbered among His people and who should not. Through all disciplinary actions regarding the Sacrament and Church membership, the Savior commands his priesthood leaders to mercifully extend the opportunity to return.
“…Ye shall not suffer any one knowingly to partake of my flesh and blood unworthily, when ye shall minister it; For whoso eateth and drinketh my flesh and blood unworthily eateth and drinketh damnation to his soul; therefore if ye know that a man is unworthy to eat and drink of my flesh and blood ye shall forbid him. Nevertheless, ye shall not cast him out from among you, but ye shall minister unto him and shall pray for him unto the Father, in my name, and if it so be that he repenteth and is baptized in my name, then shall ye receive him, and shall minister unto him of my flesh and blood. But if he repent not he shall not be numbered among my people, that he may not destroy my people, for behold I know my sheep, and they are numbered. Nevertheless, ye shall not cast him out of your synagogues, or your places of worship, for unto such shall ye continue to minister; for ye know not but what they will return and repent, and come unto me with full purpose of heart, and I shall heal them; and ye shall be the means of bringing salvation unto them. Therefore, keep these sayings which I have commanded you that ye come not under condemnation; for wo unto him whom the Father condemneth. (3 Nephi 18:28-33)
-Why would partaking of the bread and water of the Sacrament unworthily be spiritually detrimental to the person who does so?
-Since we all sin to some degree week after week, what kind of sin(s) would cause a person to be unworthy to eat and drink the emblems of Christ’s flesh and blood?
-If the symbolic emblems of Christ’s body and blood are administered by one who does not have authority from Christ to do so, would partaking unworthily in that circumstance have a negative spiritual affect?