Great Lent was traditionally used as a time to prepare catechumens for baptism. At the end of Great Lent – for Lazarus Saturday or on Holy Saturday – the catechumens were illumined in baptism. This is reflected in the fact that we still sing “As many as have been baptized into Christ…” during these festal Liturgies in place of singing “Holy God...” In the week after Pascha, after the catechumens had been newly baptized, there was continued catechetical work in the early Church to help those newly initiated into Christ to understand what they had experienced. St. John Chrysostom, addresses words to the newly baptized Christians:
You shall be called “newly-illuminated,” because your light is always new, if you wish it that way, and it is never extinguished. Whether we shall have it so or not, night follows the light of this world; but the darkness knows not the shining of this new light. The light shines in the darkness; and the darkness grasped it not. Certainly, the world is not as bright when the sun rises as is the soul which is illumined and becomes brighter from the grace it has received from the Spirit.
Consider more closely the nature of these things. When night falls and it is dark, many a time a man sees a rope and thinks it is a snake; and when a friend approaches him, he flees from him as if he were a foe; when he hears a noise, he is frightened. Nothing like this would happen in the light of day; everything is seen then just as it really is.
This same thing happens in the case of our soul. Whenever grace comes and drives out the darkness from our mind, we learn the exact nature of things; what frightened us before, now becomes contemptible in our eyes. We no longer are afraid of death after we have learned carefully from this holy initiation that death is not death but a sleep and repose which lasts for but a time. Nor are we afraid of poverty or disease or any such misfortune, because we know that we are on our way to a better life, which is impervious to death and destruction and is free from all such inequality.
Let us, then, no longer stay gaping after the good things of this life, such as luxurious foods and expensive clothing. For you have the greatest of garments, you have a spiritual banquet, you have the glory which comes from on high; Christ has become all things for you: table, clothing, house, head, and root. For all you who have been baptized into Christ have put on Christ. See how He has become your clothing.
Your shining robe now arouses admiration in the eyes of all who behold you, and the radiance of your garments proves that your souls are free from every blemish. For the future, all of you, both you who have just deserved the gift and all who have already reaped for yourselves the benefit of His munificence, must make the excellence of your conduct visible to all and, after the fashion of a torch, you must illumine those who look upon you. For if we should be willing to guard the brightness of this spiritual robe, as time goes on it will send forth a more brilliant luster and an abundance of gleaming light, a thing which cannot happen in the case of material garments.
For even if we multiply the care we take of our bodily clothes ten thousand times, the passing years leave them threadbare, and by the time they have gotten old they are worn away to nothing. If we keep them stored away, the moths get at them or they are ruined by the many other things which destroy material garments. If, however, we are eager to do our fair share, the garment of virtue will not become soiled nor feel the onslaught of age, but as time passes, so much the more does it reveal the fresh sheen of its beauty and its radiant light.
(Baptismal Instructions, pp. 175-176, 114)