St. Paul made it clear that whatever we do, without love, means nothing. And the Lord said that not everyone who calls to him, 'Lord, Lord,' will enter the kingdom of God. Likewise, one can go to Mass, participate in church activities... but has no personal relationship with Christ, then he is only nominally Christian, one who has not built his house on rock.
Yesterday was the Solemnity of the Most Holy Body and Blood of Christ. Anyone who does receive the Holy Eucharist must realize that in receiving it, the Lord becomes even closer than one's own flesh and Blood. Here is the opportunity to establish this intimate relationship. Receiving the Lord in vain is worse than not receiving him at all.