Communion is about Jesus' Faithfulness, Not Yours

While each time the Lord’s Supper is to be celebrated, God’s people reenact

this meal as interpreted by Jesus, the essence of the sacrament as instituted by Jesus is not the

subjective state of the recipient–“I am sad enough or worthy enough to partake?” Instead, the essence of

the sacrament is found in Christ’s promise to be present with his people through these elements, the

bread and wine. This will be clear in the next few verses when Jesus ties the eating of the sacramental

bread and the drinking of the cup of wine to abiding presence of the kingdom, which is finally

consummated at the last day. –Kim Riddlebarger

The reason why we do not despair or give up hope despite our sin and

our weakness, is only because our salvation does not depend upon our strength and our determination to

do what is right. Rather, our salvation depends upon Jesus drinking the cup of wrath and enduring the

rejection from his father while suffering upon the cross. --Kim Riddlebarger

and spurgeon:
Thy standing is not in thyself-it is
in Christ; thine acceptance is not in thyself, but in thy Lord; thou art as much accepted of God to-day, with all thy sinfulness, as thou wilt be
when thou standest before his throne, free from all corruption. O, I beseech thee, lay hold on this precious thought, perfection in Christ! For
thou art "complete in him." With thy Saviour's garment on, thou art holy as the Holy one.