"Describe spiritual realities in spiritual terms"

"We have not received the spirit of the world
but the Spirit who is from God,
so that we may understand the things freely given us by God.
And we speak about them not with words taught by human wisdom,
but with words taught by the Spirit,
describing spiritual realities in spiritual terms."
- 1 Corinthians

Saint Paul therefore teaches us that we must describe the contents of the chalice after the consecration as the Precious Blood of the Lord, because the substance is no longer wine but the Blood of Christ.
We must describe the Eucharist no longer as bread after the consecration but only the Body of Christ, "describing spiritual realities in spiritual terms."

(Photo: Holy Mass in the extraordinary form at Kenrick-Glennon Seminary, courtesy of wdtprs.com)