Exod 26:1

“It should be known that just as a garment is woven on two beams, namely the upper and the lower, so charity is held in two commandments, that is, in the love of God and of neighbor. For it is written: "You shall love the Lord your God with all your heart, and with all your soul, and with all your strength; and your neighbor as yourself." Therefore whoever takes care to have a wedding garment at the wedding must keep these two commandments of charity. For this is why, in the prophet Ezekiel, the vestibule of the gate of that city situated on the mountain is measured at two cubits, because surely the entrance to the heavenly city is not opened to us if in this Church, which is called a vestibule because it is still outside, the love of God and neighbor is not maintained. This is why scarlet twice-dyed is commanded to be woven into the curtains of the tabernacle. You are, brothers, you are the curtains of the tabernacle, who veil heavenly secrets in your hearts through faith. But twice-dyed scarlet must be in the curtains of the tabernacle. For scarlet has the appearance of fire. And what is charity, if not fire? But this charity must be twice-dyed, so that it may be dyed through the love of God, and dyed through the love of neighbor.”

“In so far as the cardinal virtues receive their form from charity, they are represented by the four ornaments of the tabernacle, the four sheets, skins of violet, curtains of goat hair, and rams' skins dyed red. The sheets correspond to temperance, the purple skins to the heavenly colors of prudence, the curtains of goat hair to justice, the rams' skins dyed red to fortitude. Or again, in the ornaments of the Dwelling, there are four colors: linen-white, in which there is temperance; violet revealing prudence; purple, the color of royal clothing, meaning justice; and red, that is, the color of fire, fortitude. And in this manner they adorn the Dwelling on all four sides. Likewise, they stabilize, and lead in through the door, through the four sides of the city, stabilized by hope to an equal rule.”