**Who’s “we”, though
? Priest - or people ? **
**Just to clarify: when Mass is offered facing eastwards: **
left and right are reckoned from the POV of a viewer looking at the congregation
from the altar. So when the priest turns round
from the altar
to the people - that is the POV adopted for deciding which side is which : not the POV of the people looking at the altar and at the priest’s back.
As to why - perhaps because the Corpus on the Crucifix on the altar is facing the people. But that is sheer guesswork
**So: **
- Epistle side = priest’s left = people’s right
- Gospel side = priest’s right = people’s left
The right is the “nobler” side, the left is the “inferior” side. Which is perhaps why the “sinister” side in heraldry is the left side, from the POV of the person behind the shield - just the same as in the Mass.
A rule to remember which side of the altar is which: the right or Gospel side is that from the POV of the Corpus ##