By Fr. Nnamdi Moneme, OMV, Catholic Exchange - I have had the great privilege of offering Mass several times in the many convents of the Missionaries of Charity sisters. So, I am used to seeing these words in a prominent place in the sacristy where priests prepare for Holy Mass: “Priest of Jesus Christ, celebrate this Holy Mass as if it were your first Mass, your last Mass, your only Mass... There is a double invitation in these words to all the faithful, particularly to the priest, if we are going to experience the powerful transforming power of each Mass.