"If it be objected to us on this subject that we ourselves are accustomed to observe certain days, as for example the Lord’s day, the Preparation, the Passover, or Pentecost, I have to answer, that to the perfect Christian, who is ever in his thoughts, words, and deeds serving his natural Lord, God the Word, all his days are the Lord’s, and he is always keeping the Lord’s day."Origen
Against Celsus Bk. 8 Ch. XXII Vol. 4

"Again, he who considers that “Christ our Passover was sacrificed for us,” and that it is his duty to keep the feast by eating of the flesh of the Word, never ceases to keep the paschal feast; for the pascha means a “Passover,” and he is ever striving in all his thoughts, words, and deeds, to pass over from the things of this life to God, and is hastening towards the city of God."Origen
Against Celsus Bk. 8 Ch. XXII Vol. 4

"He also who is unceasingly preparing himself for the true life, and abstaining from the pleasures of this life which lead astray so many, - who is not indulging the lust of the flesh, but “keeping under his body, and bringing it into subjection,” - such a one is always keeping Preparation-day."Origen
Against Celsus Bk. 8 Ch. XX Vol. 4

And, finally, he who can truly say, “We are risen with Christ,” and “He hath exalted us, and made us to sit with Him in heavenly places in Christ,” is always living in the season of Pentecost; and most of all, when going up to the upper chamber, like the apostles of Jesus, he gives himself to supplication and prayer, that he may become worthy of receiving “the mighty wind rushing from heaven,” which is powerful to destroy sin and its fruits among men, and worthy of having some share of the tongue of fire which God sends.Origen
Against Celsus Bk. 8 Ch. XXII Vol. 4

"He also who is unceasingly preparing himself for the true life, and abstaining from the pleasures of this life which lead astray so many, - who is not indulging the lust of the flesh, but “keeping under his body, and bringing it into subjection,” - such a one is always keeping Preparation-day."Origen
Against Celsus Bk. 8 Ch. XX Vol. 4

"Now-a-days find more doors of heathens without lamps and laurel-wreaths than of Christians."Tertullian
On Idolatry Ch. XV, Vol. 3

"The Saturnalia and New-year’s and Midwinter’s festivals and Matronalia are frequented - presents come and go - New-year’s gifts - games join their noise - banquets join their din! Oh better fidelity of the nations to their own sect, which claims no solemnity of the Christians for itself! Not the Lord’s day, not Pentecost, even if they had known them, would they have shared with us; for they would fear lest they should seem to be Christians. We are not apprehensive lest we seem to be heathens! If any indulgence is to be granted to the flesh, you have it."Tertullian
On Idolatry Ch. XIV, Vol. 3

"Again, compare the festivals, observed among us as these have been described above, with the public feasts of Celsus and the heathen, and say if the former are not much more sacred observances than those feasts in which the lust of the flesh runs riot, and leads to drunkenness and debauchery. It would be too long for us at present to show why we are required by the law of God to keep its festivals by eating “the bread of affliction,” (Deu_16:3) or “unleavened with bitter herbs,” (Exo_12:8) or why it says, “Humble your souls,” (Lev_16:29) and such like. For it is impossible for man, who is a compound being, in which “the flesh lusteth against the Spirit, and the Spirit against the flesh,” (Gal_5:17) to keep the feast with his whole nature; for either he keeps the feast with his spirit and afflicts the body, which through the lust of the flesh is unfit to keep it along with the spirit, or else he keeps it with the body, and the spirit is unable to share in it. But we have for the present said enough on the subject of feasts."Origen
Against Celsus Bk. 8 Ch. XXII Vol. 4