"Altar rails give “a clear designation as to what is the sanctuary,” Father Markey said. “The word ‘sanctuary’ comes from the word ‘holy,’ which means ‘set apart.’ The sanctuary is set apart from the rest of the church because it reinforces our understanding of what holiness is. The sanctuary is symbolically the head of the church and represents Christ as the head.”
"McNamara traces church architecture roots to the Temple of Solomon: The large room corresponded to the church nave; the Holy of Holies, an image of heaven, corresponded to today’s sanctuary. They were separated visually by the great veil, which was torn when Christ died.
“[The altar rail] is still a marker of the place where heaven and earth meet, indicating that they are not yet completely united,” McNamara explained.
“But, at the same time, the rail is low, very permeable, and has a gate, so it does not prevent us from participating in heaven. So we could say there is a theology of the rail, one which sees it as more than a fence, but as a marker where heaven and earth meet, where the priest, acting
in persona Christi , reaches across from heaven to earth to give the Eucharist as the gift of divine life.”
Source:
Architects, pastors and parishioners find it enhances reverence in church.
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