The Catechism in Questions & Answers

512. What are the effects of Holy Communion?

Holy Communion establishes intimate fellowship with Jesus Christ. It imparts the nature and strength of the Son of God. Partaking of Holy Communion also serves to promote the unity of the believers with one another, because they develop together into the nature of Jesus Christ. Thus Holy Communion is an important means of preparation for the return of Christ.

“For we, though many, are one bread and one body, for we all partake of that one bread.”
1 Corinthians 10: 17