The cup of blessing pertains to the cup of grape juice that we used for our Lord’s Supper. In partaking the cup, we remember the Lord’s death on the cross to pay the penalty for our sins. His blood was shed for the remission of our sins. Spiritually the believer is nourished and strengthened in the partaking of the Lord’s Supper. He does so with prior self-examination, confessing his sins before God in prayer. Amen.