Translated by Ch. Browne and J. Swallow.
III. Of these on a future occasion; for the present the Festival is the Theophany or Birth-day, for it is called both, two titles being given to the one thing. For God was manifested to man by birth. On the one hand Being, and eternally Being, of the Eternal Being, above cause and word, for there was no word before The Word; and on the other hand for our sakes also Becoming, that He Who gives us our being might also give us our Well-being, or rather might restore us by His Incarnation, when we had by wickedness fallen from wellbeing. The name Theophany is given to it in reference to the Manifestation, and that of Birthday in respect of His Birth.
IV. This is our present Festival; it is this which we are celebrating to-day, the Coming of God to Man, that we might go forth,  or rather (for this is the more proper expression) that we might go back to God—that putting off the old man, we might put on the New; and that as we died in Adam, so we might live in Christ,  being born with Christ and crucified with Him and buried with Him and rising with Him.  For I must undergo the beautiful conversion, and as the painful succeeded the more blissful, so must the more blissful come out of the painful. For where sin abounded Grace did much more abound;  and if a taste condemned us, how much more doth the Passion of Christ justify us? Therefore let us keep the Feast, not after the manner of a heathen festival, but after a godly sort; not after the way of the world, but in a fashion above the world; not as our own but as belonging to Him Who is ours, or rather as our Master's; not as of weakness, but as of healing; not as of creation, but of re-creation.
V. And how shall this be? Let us not adorn our porches, nor arrange dances, nor decorate the streets; let us not feast the eye, nor enchant the ear with music, nor enervate the nostrils with perfume, nor prostitute the taste, nor indulge the touch, those roads that are so prone to evil and entrances for sin; let us not be effeminate in clothing soft and flowing, whose beauty consists in its uselessness, nor with the glittering of gems or the sheen of gold  or the tricks of colour, belying the beauty of nature, and invented to do despite unto the image of God; Not in rioting and drunkenness, with which are mingled, I know well, chambering and wantonness, since the lessons which evil teachers give are evil; or rather the harvests of worthless seeds are worthless. Let us not set up high beds of leaves, making tabernacles for the belly of what belongs to debauchery. Let us not appraise the bouquet of wines, the kickshaws of cooks, the great expense of unguents. Let not sea and land bring us as a gift their precious dung, for it is thus that I have learnt to estimate luxury; and let us not strive to outdo each other in intemperance (for to my mind every superfluity is intemperance, and all which is beyond absolute need),—and this while others are hungry and in want, who are made of the same clay and in the same manner.
 Ephes. iv. 22, 24.
 1 Cor. xv. 22.
 Col. ii. 11.
 Rom. v. 20.
 Rom. xiii. 13.
Reference address : https://www.elpenor.org/gregory-nazianzen/birthday-christ.asp?pg=3