This question is admittedly somewhat technical, but I became curious after I attended a friend’s baptism yesterday, which was by single immersion.
The performance of the rite was as follows: While the participant stood in a pool of water, the minister invoked the Trinitarian formula and, upon saying the words, appended the following phrase as he immersed the participant into the water:
“Buried with Him in the likeness of His death, raised with Him in the likeness of His resurrection.”
My question is twofold: **First, does the addition of the extraneous words affect the form and thus the validity of the sacrament? A close reading of the Summa (III, Q.66, art. 6) suggests not. Second, must the Trinity be invoked as the participant is being immersed? As stated above, the minister in this case had already completed the Trinitarian invocation before continuing to the immersion.
And please, no comments on the legalistic nature of my question This is an exercise in metaphysics for a catholic crowd.