As Paul said, we are many members of the one Body of Christ because we share in the One Bread.
1 Corinthians
Paul believed in the Eucharist and Christ present in it.
"Blessed be the God and Father of our Lord Jesus Christ, who hath blessed us with all spiritual blessings in heavenly places IN CHRIST." Eph. 2:6.
"...which is CHRIST IN YOU the hope of glory." Co. 1:27.
We, as believers are ALREADY IN CHRIST. He is ALREADY IN US. Why would Paul believe that we would need to continue to put Christ into us?
A good thinking cap would do wonders.