You willfully came late on a Sunday Mass:
Part of your Sunday obligation is attending Mass, and coming to it on time. If you willfully come late to Mass, you do not fulfill your obligation properly. What I normally advise is: If you run late for an early morning mass, wait for the next. However, if you are late for a good reason such as health or some other unavoidable issue, it’s then okay to receive.
It is important to examine oneself to be conscious of Jesus whenever we want to receive. DO NOT LOSE SIGHT OF HIM. Do not approach the altar because you want to be seen, or you want to “appear”. Come to Jesus because your heart calls out to him. Whenever you receive Jesus, let it be out of love and devotion.
“As Catholics, we fully participate in the celebration of the Eucharist when we receive Holy Communion. We are encouraged to receive Communion devoutly and frequently. In order to be properly disposed to receive Communion, participants should not be conscious of grave sin and normally should have fasted for one hour.
A person who is conscious of grave sin is not to receive the Body and Blood of the Lord without prior sacramental confession except for a grave reason where there is no opportunity for confession. In this case, the person is to be mindful of the obligation to make an act of perfect contrition, including the intention of confessing as soon as possible (canon 916). A frequent reception of the Sacrament of Penance is encouraged for all.”
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Glory be to Jesus…
How can the Holy Eucharist be dangerous to our immortal soul?
It is not that the Holy Eucharist is a danger to our soul. It is that we hurt Him when we receive Him in the state of mortal sin. The nature of mortal sin is so bad, that it results in our detachment from God’s saving grace. There are 3 criteria for a sin to be mortal (I found this from a response in Catholic Answers):
1. The sinful act must be grave matter, defined by the catechism in paragraph 1858 as a violation of one of the Ten Commandments
2. The sinful act must be known to be sinful
3. The sinful act must be freely chosen in light of the knowledge that it is sinful
This shows that we knowingly and willfully offend Our Lord, which hurts Him very much and stains, or even breaks, our relationship with Him. “The effect of mortal sin is to remove sanctifying grace—the life of God within us—from our soul. Without sanctifying grace, we cannot enter Heaven, which is why this sin is called mortal.” “As Saint Paul (1 Corinthians 11:27) tells us, ‘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.'”
( Thought Co.: https://www.thoughtco.com/mortal-venial-sin-confession-and-communion-3970770 )