Luke 24:4

The messengers of the health-bearing resurrection and their shining garments stand for tokens of pleasantness and rejoicing. For Moses preparing plagues against the Egyptians, perceived an angel in the flame of fire. But not such were those who appeared to the women at the sepulchre, but calm and joyful as became them to be seen in the kingdom and joy of the Lord. And as at the Passion the sun was darkened, holding forth signs of sorrow and woe to the crucifiers of our Lord, so the angels, heralds of life and resurrection, marked by their white garments the character of the health-bearing feast day.

But how is it that Mark has mentioned one young man sitting in white garments, and Matthew one, but John and Luke relate that there were seen two angels sitting in white garments.

(de Con. Ev. ut sup.) We may understand that one Angel was seen by the women, as both Mark and Matthew say, so as supposing them to have entered into the sepulchre, that is, into a certain space which was fenced off by a kind of wall in front of the stone sepulchre; and that there they saw an Angel sitting on the right hand, which Mark says, but that afterwards when they looked into the place where our Lord was lying, they saw within two other Angels standing, (as Luke says,) who spoke to encourage their minds, and build up their faith. Hence it follows, And as they were afraid.

When then they found not the body of Christ which was risen, they were distracted by various thoughts, and for their love of Christ and the tender care they had shown Him, were thought worthy of the vision of angels. For it follows, And it came to pass as they were much perplexed thereabout, behold, two men stood by them in shining garments.

But as when the Body of our Lord lay in the sepulchre, Angels are said to have stood by, so also at the time of consecration are they to be believed to stand by the mysteries of Christ.