I attended Catholic School from Kindergarten through 8th grade. I remember vividly the day that we were told it was now “ok” to receive in the hand (sometime in the early 70’s). I was about 10 years old. I have to tell you my initial sense (which I am convinced was an actual grace) was that it was wrong, wrong, wrong. It was at the time not made clear that we had the option to continue to receive on the tongue and so it felt somewhat more like coercion. I have to tell you I began to feel rather badly every time I went to communion (we used to go to daily mass). I feel bad even now thinking about the sense of wrongness I experienced even at such a young age. I really believe that it was the beginning of the leavening of my belief in the Eucharist and subsequently a diminishment of my faith in later years from which I have recovered in recent years (Thanks be to God).
As with so many other things in our worship, the exterior signs that we participate in are some of the vary actions that orient our internal dispositions. In our worship there is a principle at work, it is that grace is received according to the mode and disposition of the receiver. When our exterior actions are altered, at a certain degree it is possible to arrive at a danger point to where our interior disposition is so affected that the sense of the sacred is diminished and so accordingly the graces we receive diminish as well.
I have known people who upon witnessing the seemingly never ending irreverences committed at mass, have ceased going to mass regularly or altogether because the impression (at least in their minds) is that little or nothing sacred is at work at mass since the exterior signs in the form of due reverence by the congregation (and tragically sometimes the priest himself) are absent or lacking. Here lies a subtle and virtually imperceptible danger to the faith.
Our actions teach others, more or less, according to a correspondence to the value in which we hold something sacred. In the mass, where the miracle of miracles occurs, it should never be lost in our actions that it is God himself present in our midst.