Cardinal Francis Arinze, Prefect of the CDW, responded to the question on June 5, 2003 (Prot. N. 855/03/L):
Code:
Responsum: Negative, et ad mensum [No, for this reason]. The mens [reasoning] is that the prescription of the Institutio Generalis Missalis Romani, no. 43, is intended, on the one hand, to ensure within broad limits a certain uniformity of posture within the congregation for the various parts of the celebration of Holy Mass, and on the other, to not regulate posture rigidly in such a way that those who wish to kneel or sit would no longer be free.
The BCL Newsletter continues: “In the implementation of the General Instruction of the Roman Missal, therefore,** posture should not be regulated so rigidly as to forbid individual communicants from kneeling or sitting when returning from having received Holy Communion**” (p. 26. Emphasis added.)
Earlier, the CDW had reaffirmed kneeling after the Ecce Agnus Dei [Behold, the Lamb of God] when it amended the relevant paragraph (no. 43) of the GIRM for the universal Church by adding the following clarifying sentence:
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**Where it is the custom that the people remain kneeling** from the end of the Sanctus until the end of the Eucharistic Prayer, **and before Communion when the priest says Ecce Agnus Dei,** **this is laudably retained.** [See AB March 2003, p. 4 sidebar.]
(my bolds)